The ISIS files: What leaked documents reveal about terror recruits

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Leaked ISIS Recruitment Forms Give Rare Look Inside Terror Operation

A trove of ISIS personnel records obtained by NBC News has now been analyzed by experts at West Point, who say it's the largest and "most significant" document cache of its kind, providing new insight into the terror group's grand ambitions and diverse recruits.

The files reveal that the jihadists who joined the Islamic State in 2013 and 2014 were largely uninterested in suicide missions, better educated than expected and, to the alarm of those trying to stop the export of terror, very well-traveled.

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NBC News received the dossiers from a Syrian man who said he stole the information, stored on a flash drive, from a senior ISIS commander. Over the last month, NBC News has worked with the Combating Terrorism Center at the elite military academy to transform them into a database of more than 4,000 foreign fighters from 71 countries.

The analysts believe the documents, which were also given to a British media outlet, are genuine and the details in them revelatory. They show the bureaucracy behind ISIS' enlistment operation and a surprisingly varied fighting force captivated by the promise of a global Muslim caliphate.

"The largest takeaway from these documents is the massive diversity of the population," Brian Dodwell, deputy director of the Combating Terrorism Center at West Point, told NBC News.

RELATED: ISIS destroys oldest Iraq monastery:

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ISIS destroys oldest Iraq monastery
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The ISIS files: What leaked documents reveal about terror recruits
This combination of two satellite images provided by DigitalGlobe, taken on March 31, 2011, top, and Sept. 28, 2014, shows the site of the 1,400-year-old Christian monastery known as St. Elijah’s, or Dair Mar Elia, on the outskirts of Mosul, Iraq. These satellite photos obtained by The Associated Press in January 2016 confirm what church leaders and Middle East preservationists had feared: The monastery has been reduced to a field of rubble, yet another victim of the Islamic State's relentless destruction. (DigitalGlobe via AP)
In this Nov. 7, 2008 photo, U.S. Army soldiers tour St. Elijah's Monastery on Forward Operating Base Marez in Mosul, Iraq. âIt was a sacred place. We literally bent down physically to enter, an acquiescence to the reality that there was something greater going on inside,â remembered military chaplain Jeffrey Whorton. (AP Photo/Maya Alleruzzo)
In this Nov. 7, 2008, photo, a U.S. Army chaplain gestures toward the place where the 101st Airborne Division's "screaming eagle" was painted above a door at St. Elijah's Monastery on Forward Operating Base Marez in Mosul, Iraq. The chaplain, recognizing the siteâs historical and cultural significance, kicked the troops out and the U.S. Army began a preservation initiative that became a pet project for a series of chaplains who led thousands of soldiers on tours through its weathered walls. (AP Photo/Maya Alleruzzo)
FILE - In this Nov. 7, 2008, file photo, U.S. Army soldiers tour St. Elijah's Monastery on Forward Operating Base Marez in Mosul, Iraq, about 360 kilometers (225 miles) northwest of Baghdad. St. Elijahâs has officially joined a growing list of more than 100 demolished religious and historic sites, including mosques, tombs, shrines and churches. The Islamic State group has defaced or ruined ancient monuments in Nineveh, Palmyra and Hatra. Museums and libraries have been looted, books burned, artwork crushed. (AP Photo/Maya Alleruzzo, File)
In this Aug. 21, 2009, photo released by the U.S. Army, visitors assigned to the Logistic Civil Augmentive Program from Forward Operating Base Speicher, near Tikrit, Iraq, stand at the entrance to the ruins of St. Elijahâs Monastery after completing a tour there, at Forward Operating Base Marez in Mosul, Iraq. The 1,400-year-old monastery has been reduced to a field of rubble, yet another victim of the Islamic State's relentless destruction. (MC1 (SCW) Carmichael Yepez/U.S. Army via AP)
In this Jan. 21, 2009, photo released by the U.S. Department of Defense, a soldier walks toward St. Elijahâs Monastery at Forward Operating Base Marez in Mosul, Iraq. The Islamic State group, which broke from al-Qaida and now controls large parts of Iraq and Syria, has killed thousands of civilians and forced out hundreds of thousands of Christians, threatening a religion that has endured in the region for 2,000 years. Along the way, its fighters destroy anything they consider contrary to their interpretation of Islam. (JoAnn Makinano/Department of Defense via AP)
FILE - This Nov. 7, 2008, file photo shows the sanctuary of St. Elijah's Monastery on Forward Operating Base Marez in Mosul, Iraq, about 360 kilometers (225 miles) northwest of Baghdad. Maj. Geoffrey Bailey, now a U.S. Army command chaplain in Kabul, Afghanistan, who led prayers and tours at St. Elijahâs, said the monastery "provided troops a historical glimpse into the great history of Iraq and a chance to indirectly connect with the people who make the country culturally and sociologically rich and worth fighting for.â (AP Photo/Maya Alleruzzo, File)
This Nov. 7, 2008, photo shows St. Elijah's Monastery on the outskirts of Mosul, Iraq, about 360 kilometers (225 miles) northwest of Baghdad. St. Elijahâs served as a center of the regional Christian community for centuries, attracting worshippers from throughout the region to pray with its priests. (AP Photo/Maya Alleruzzo)
FILE - In this Nov. 7, 2008 file photo, U.S. Army chaplain Geoffrey Bailey leads soldiers on a tour of St. Elijah's Monastery on Forward Operating Base Marez on the outskirts of Mosul, 360 kilometers (225 miles) northwest of Baghdad, Iraq. The oldest Christian monastery in Iraq, St. Elijahâs stood as a place of worship for 1,400 years. Satellite photos obtained by The Associated Press confirm that the monastery in Iraq has been reduced to a field of rubble, yet another victim of the Islamic State's relentless destruction. (AP Photo/Maya Alleruzzo, File)
In this April 3, 2010, photo released by the U.S. Army, soldiers celebrate a Catholic Easter mass at St. Elijah's Monastery on the outskirts of Mosul, Iraq. Before it was razed, the partially restored, 27,000-square-foot stone and mortar building stood fortress-like on a hill above Mosul. Although the roof was largely missing, it had 26 distinctive rooms including a sanctuary and chapel. Satellite photos taken after its destruction show âthat the stone walls have been literally pulverized,â said imagery analyst Stephen Wood, CEO of Allsource Analysis, who pinpointed the destruction between August and September 2014. (Staff Sgt. Russell Lee Klika/U.S. Army via AP)
In this Nov. 7, 2008, photo, U.S. Army soldiers tour St. Elijah's Monastery on Forward Operating Base Marez on the outskirts of Mosul, Iraq. Maj. Geoffrey Bailey, now a US Army command chaplain in Kabul, Afghanistan, who led prayers and tours at St. Elijahâs, said news of the destruction of the monastery by militants was âincredibly disappointing. In the midst of the strife and suffering of combat, a symbol of hope set against the verdant hills of Mosul sprang forth and provided a momentary respite for weary sojourners, much like it had for...centuries prior.â (AP Photo/Maya Alleruzzo)
In this Dec. 7, 2005, photo released by the U.S. Army, soldiers can see the city of Mosul, Iraq, from the top of the stairwell at St. Elijahâs Monastery during a visit arranged by Capt. John P. Smith, a chaplain with the 142nd Corps Support Battalion. U.S. troops and advisers had worked to protect and honor the monastery situated on a Forward Operating Base, a hopeful endeavor in a violent place and time. (Sgt. Mitch Armbruster/U.S. Army via AP)
In this April 3, 2010, photo released by the U.S. Army, soldiers celebrate a Catholic Easter Mass at St. Elijah's Monastery on the outskirts of Mosul, Iraq. Satellite photos obtained by The Associated Press confirm the worst fears of church authorities and preservationists: Iraq's oldest Christian monastery has been completely wiped out since the takeover of Mosul by the Islamic State group. (Sgt. Shannon R. Gregory/U.S. Army via AP)
**APN ADVANCE FOR NOV 23** U.S. Army soldiers tour St. Elijah's Monastery, which sits on Forward Operating Base Marez in Mosul, 360 kilometers (225 miles) northwest of Baghdad, Iraq, Friday, Nov. 7, 2008. In a country where Christians have become a threatened and dwindling minority, U.S. forces are safeguarding a 1,400-year-old monastery -- Iraq's most ancient -- against a time when peace, reconciliation and archaeological detective work may occur.(AP Photo/Maya Alleruzzo)
**APN ADVANCE FOR NOV 23** U.S. Army soldiers tour St. Elijah's Monastery, which sits on Forward Operating Base Marez in Mosul, 360 kilometers (225 miles) northwest of Baghdad, Iraq, Friday, Nov. 7, 2008. In a country where Christians have become a threatened and dwindling minority, U.S. forces are safeguarding a 1,400-year-old monastery -- Iraq's most ancient -- against a time when peace, reconciliation and archaeological detective work may occur.(AP Photo/Maya Alleruzzo)
**APN ADVANCE FOR NOV 23** The sanctuary of St. Elijah's Monastery, which sits on Forward Operating Base Marez is seen in Mosul, 360 kilometers (225 miles) northwest of Baghdad, Iraq, Friday, Nov. 7, 2008. In a country where Christians have become a threatened and dwindling minority, U.S. forces are safeguarding a 1,400-year-old monastery -- Iraq's most ancient -- against a time when peace, reconciliation and archaeological detective work may occur.(AP Photo/Maya Alleruzzo)
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"We are talking an average age of around 26, 27 years old but we're talking about everywhere from teenagers up until men in their 60s," Dodwell added. "We're talking about very diverse backgrounds from an education perspective — individuals who list their education as none up to those who listed their educations as Ph.D.s, masters degrees, MBAs ... Everything from laborers to doctors and lawyers."

Read the Combating Terrorism Center report on the ISIS files

The papers, written in Arabic and fully translated by NBC and West Point for the first time, provide a snapshot of each fighter — from nom de guerre and blood type to travel history and contact numbers for next of kin.

Among the key findings:

Most don't want to be martyrs

Each candidate was asked if he wanted to be a regular fighter or a suicide bomber or suicide fighter, but only 12 percent ticked the box for martyrdom.

That ratio stands in stark contrast to another set of foreign fighters, those who joined Al Qaeda in Iraq in 2006 and 2007, more than half of whom volunteered to blow themselves up, according to West Point. And analysts say the disparity reflects how ISIS marketed itself to the world and the kind of future it envisioned.

"While they do need some suicide bombers, if all of their troops selected into the suicide category who would be left to fill that conventional army? Who would be left to serve as the Sharia officials, the police or the administrative?" Dodwell said.

"They're selling this narrative of victory and sustaining... Many of these individuals it would seem are buying into that message and are going into there to live — not die."

They cover the generation gap

Nearly two-thirds of the enlistees were in the 21-30 age group, but the other ends of the spectrum were also well-represented. Some 40 recruits were under age 15 and about 400 were under 21. Almost a quarter fell between ages 31 and 40. About 4 percent were between 41 and 50 and there were even 42 men over the age of 50.

The oldest person in the database was nearly 70, a married father of five from Kyrgystan who wanted to be a fighter and not a suicide volunteer.

Many have families

While six out of 10 fighters were single, 30 percent reported being married — and they had more 2,000 children between them. The notes on some of the applications show that some showed up with hopes of bringing their families along later if they could get the money needed for travel.

The Caliphate called to them

The dates on the records give a sense of what might have propelled some these men to join ISIS. One peak came in November 2013, a few months after the militants split off from the Al Qaeda-affiliated Nusra Front and rebranded themselves as the Islamic State or ISIS.

But the biggest recruitment period was July 2014, following some of ISIS' most significant territorial seizures and the announcement that it was establishing a caliphate with dominion over the world's Muslims.

They were schooled

"They are perhaps more educated than we would expect," Dodwell said.

A third went to high school and a quarter had a college education; only 17 percent said they stopped their schooling after elementary or middle school. That level of education was higher than the average for many of the countries the men called home.

While the stats might suggest that the fighters had prospects in their homeland, the West Point experts noted that many of them had more menial jobs than their education might suggest — a possible source of frustration that could have played into their decision to join up.

The group was less educated on Islam than might be predicted. Seventy percent said they had only a basic understanding of sharia. And in an unexpected turn, those with a deeper understanding of Islamic law were actually less likely to choose to be suicide bombers or fighters, despite the religious justification for suicide attacks.

They're jacks of all trades

The applicants came from all job sectors. Listed occupations included beekeeper, perfume salesman, airline steward, Saudi intelligence worker, soldier in the Tunisian army. One reported he was in "counter-narcotics," another that he was a hashish dealer. "May God forgive him and us!" that file added. There was someone who worked at a Starbucks in London, and another who boasted of being a mixed-martial arts trainer with gold medals to his name.

Overall, though, the fighters were more likely to have worked in low-skilled jobs. Only 104 had high-skilled or white-collar positions. There were 700 laborers, roughly 10 times the number of teachers, IT employees, or those in the military or police. But the vast majority were employed before they joined: Only 255 said they were jobless. Another big group had yet to enter the labor force: 656 students.

RELATED: Turkey, Syria, and ISIS fighting history:

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Turkey, Syria, and ISIS fighting history
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The ISIS files: What leaked documents reveal about terror recruits
In this image provided by the U.S. Air Force, an F-16 Fighting Falcon takes off from Incirlik Air Base, Turkey, as the U.S. on Wednesday, Aug. 12, 2015, launched its first airstrikes by Turkey-based F-16 fighter jets against Islamic State targets in Syria, marking a limited escalation of a yearlong air campaign that critics have called excessively cautious. (Krystal Ardrey/U.S. Air Force via AP))
Left-wing protesters try to avoid the effects of tear gas fired by police, by burning barricades In Istanbul, Saturday, July 26, 2015, during clashes between police and people protesting against Turkey's operation against Kurdish militants. Turkey has bombed Islamic State positions near the Turkish border in Syria, also targeting Kurdish rebels in Iraq and carried out widespread police operations against suspected Kurdish and IS militants and other outlawed groups inside Turkey. (AP Photo/Cagdas Erdogan) TURKEY OUT
Turkish soldiers patrol with an armoured vehicle near the border with Syria, outside the village of Elbeyli, east of the town of Kilis, southeastern Turkey, Friday, July 24, 2015. Turkish warplanes struck Islamic State group targets across the border in Syria early Friday, government officials said, a day after IS militants fired at a Turkish military outpost, killing a soldier. The bombing is a strong tactical shift for Turkey which had long been reluctant to join the U.S.-led coalition against the extremist group. (AP Photo)
As seen from outskirts of the village of Seve, on the Turkish side of the border, a Syrian opposition group flag flies on a building in the the outskirts of the village of Havar in Syria, Friday, July 24, 2015. Turkish warplanes struck Islamic State group targets across the border in Syria early Friday, government officials said, a day after IS militants fired at a Turkish military outpost, near the area of where the photo was taken, killing a soldier. The bombing is a strong tactical shift for Turkey which had long been reluctant to join the U.S.-led coalition against the extremist group. (AP Photo/Emrah Gurel)
Map locates Diyarbakir air base in Turkey and airstrikes in Syria. (Image via AP)
Map locates Kurds in Syria. (Image via AP)
Relatives of slain soldier Mehmet Yalcin Nane, killed Thursday by IS militants when they attacked a Turkish military outpost at the border with Syria, cry during his funeral in the town of Gaziantep, southeastern Turkey, Friday, July 24, 2015. Turkish warplanes struck Islamic State group targets across the border in Syria early Friday, government officials said, a day after IS militants fired at a Turkish military outpost, killing Nane. The bombing is a strong tactical shift for Turkey which had long been reluctant to join the U.S.-led coalition against the extremist group. (AP Photo/Emrah Gurel)
Protesters run away from tear gas during a demostration in Istanbul on July 24, 2015. Turkey detained 251 people in coordinated nationwide dawn raids against suspected Islamic State (IS) jihadists and Kurdish militants following a wave of deadly violence in the country, the prime minister's office said.AFP PHOTO/OZAN KOSE (Photo credit should read OZAN KOSE/AFP/Getty Images)
Turkish riot police fire rubber bullets to disperse protesters during a demostration in Istanbul on July 24, 2015. Turkey detained 251 people in coordinated nationwide dawn raids against suspected Islamic State (IS) jihadists and Kurdish militants following a wave of deadly violence in the country, the prime minister's office said.AFP PHOTO/OZAN KOSE (Photo credit should read OZAN KOSE/AFP/Getty Images)
ADANA, TURKEY - JULY 24: A military aircraft of Turkish Air Force lands at the Incirlik 10th Tanker Base Command in Saricam district, Adana on July 24, 2015. On Friday, Turkish F-16 fighter jets hit three Daesh targets in Syria in the morning. Turkish jets carried out the operation without violating the Syrian airspace, according to a statement by the Prime Ministry. (Photo by Ibrahim Erikan/Anadolu Agency/Getty Images)
A Syrian Kurdish woman sits by the window of a house in Suruc in Turkey's Sanliurfa province near the border with Syria on June 27, 2015. Kurdish forces drove Islamic State group fighters from the flashpoint Syrian border town of Kobane, after a killing spree by the jihadists left more than 200 civilians dead. AFP PHOTO / BULENT KILIC (Photo credit should read BULENT KILIC/AFP/Getty Images)
A picture taken from the Turkish side of the border in Suruc, Sanliurfa province, shows a Turkish solider standing as smoke rises from the Syrian town of Kobane, also known as Ain al-Arab, on June 27, 2015, a day after a deadly suicide bombing occurred. The Islamic State group killed 164 civilians in its offensive on the Kurdish town of Kobane, in what a monitor Friday called one of the jihadists' 'worst massacres' in Syria. AFP PHOTO/BULENT KILIC (Photo credit should read BULENT KILIC/AFP/Getty Images)
KOBANE, SYRIA - JUNE 20: (TURKEY OUT) A Kurdish People's Protection Units, or YPG fighters stand near a check point in the outskirts of the destroyed Syrian town of Kobane, also known as Ain al-Arab, Syria. June 20, 2015. Kurdish fighters with the YPG took full control of Kobane and strategic city of Tal Abyad, dealing a major blow to the Islamic State group's ability to wage war in Syria. Mopping up operations have started to make the town safe for the return of residents from Turkey, after more than a year of Islamic State militants holding control of the town. (Photo by Ahmet Sik/Getty Images)
TAL ABYAD, SYRIA - JUNE 20: (TURKEY OUT) The picture shows the wreckage left by fighting on a street in the center of the Syrian town of Kobane, also known as Ain al-Arab, Syria. June 20, 2015. Kurdish fighters with the YPG took full control of Kobane and strategic city of Tal Abyad, dealing a major blow to the Islamic State group's ability to wage war in Syria. Mopping up operations have started to make the town safe for the return of residents from Turkey, after more than a year of Islamic State militants holding control of the town. (Photo by Ahmet Sik/Getty Images)
SANLIURFA, TURKEY - JUNE 16: Turkish soldiers patrol as Syrian refugees walk to cross the Akcakale border gate in Sanliurfa province, Turkey, June 16, 2015. Kurdish fighters took full control on Tuesday of the border town of Tal Abyad, dealing a major blow to the Islamic State group's ability to wage war in Syria by cutting off a vital supply line to its self-proclaimed capital of Raqqa. According to Turkish security officials 10,000 people to come across from Syria in last three days.(Photo by Gokhan Sahin/Getty Images)
Turkish soldiers stand as smoke billows from the Syrian town of Ayn al-Arab or Kobani following the attacks by IS militants as seen from the Turkish side of the border in Suruc, Turkey, Thursday, June 25, 2015. Islamic State militants launched two major attacks in northern Syria on Thursday, storming government-held areas in the mostly Kurdish city of Hassakeh and pushing into Kobani — the Syrian Kurdish border town they were expelled from early this year — where they set off three cars bombs, killing and wounding dozens, activists and officials said.(AP Photo)
In this still image taken from video captured on a CCTV camera, made available Thursday, June 25, 2015, an explosion is captured by a camera on the Turkish side of the border, in the Kurdish town of Kobani, Syria. Islamic State militants staged a new attack on the Kurdish town of Kobani, which famously resisted a months-long assault by the Islamic militants. The attack involved a suicide car bombing that wounded scores. (AP Photo)
A Syrian refugee carries a sick woman on his back in Akcakale, southeastern Turkey, as they flee intense fighting in northern Syria between Kurdish fighters and Islamic State militants, Monday, June 15, 2015. The flow of refugees came as Syrian Kurdish fighters closed in on the outskirts of a strategic Islamic State-held town on the Turkish border. (AP Photo/Lefteris Pitarakis)
In this photo taken from the Turkish side of the border between Turkey and Syria, in Akcakale, southeastern Turkey, Kurdish fighters with the Kurdish People's Protection Units, or YPG, wave their yellow triangular flag in the outskirts of Tal Abyad, Syria, Monday, June 15, 2015. Kurdish fighters captured large parts of the strategic border town of Tal Abyad from the Islamic State group Monday, dealing a huge blow to the group which lost a key supply line for its nearby de facto capital of Raqqa, a spokesman for the main Kurdish fighting force said. (AP Photo/Lefteris Pitarakis)
FILE - In this Oct. 22, 2014, file photo, thick smoke from an airstrike by the US-led coalition rises in Kobani, Syria, as seen from a hilltop on the outskirts of Suruc, at the Turkey-Syria border. For four months, Syrian Kurdish fighters battled Islamic State militants in the rubble-strewn streets and crumpled buildings in the town of Kobani as U.S. aircraft pounded the extremists from the skies above. (AP Photo/Lefteris Pitarakis, File)
In this Wednesday, Nov. 19, 2014 photo, a young Kurdish fighter runs past sniper fire in the contested zone in Kobani, Syria. Here, Kurdish fighters backed by small numbers of Iraqi peshmerga forces and Syrian rebels, are locked in what they see as an existential battle against the Islamic State group, who swept into their town in mid-September as part of a summer blitz after the Islamic State group overran large parts of Syria and neighboring Iraq. But the battle comes with an onerous price for the town’s residents. While most managed to flee across the nearby border with Turkey, some 2,000 Kurdish civilians have opted to stay with the hope that fighting will soon subside _ a shocking contrast from the population of 50,000 that once filled these streets. (AP Photo/Jake Simkin)
Smoke rises from the Syrian city of Kobani, following airstrikes by the US led coalition, seen from a hilltop outside Suruc, on the Turkey-Syria border Monday, Nov. 17, 2014. Kobani, also known as Ayn Arab, and its surrounding areas, has been under assault by extremists of the Islamic State group since mid-September and is being defended by Kurdish fighters. (AP Photo/Vadim Ghirda)
FILE - In this Sunday, Nov. 9, 2014 file photo, a military plane of the US led coalition flies above the Syrian town of Kobani, seen from a hilltop outside Suruc, on the Turkey-Syria border. Kobani, also known as Ayn Arab, and its surrounding areas, has been under assault by extremists of the Islamic State group since mid-September and is being defended by Kurdish fighters. More than two months into its assault on Kobani, the Islamic State group still pours fighters and resources into trying to take the besieged Kurdish town, but the drive has been blunted. Aided by 270 U.S. airstrikes, the town’s determined Kurdish defenders appear to be gaining momentum, a potentially bruising reversal for the militants who only few weeks ago seemed unstoppable in their march to victory. (AP Photo/Vadim Ghirda, File)
A missile is fired from Islamic State positions in Kobani, seen from a hilltop outside Suruc, on the Turkey-Syria border Thursday, Nov. 6, 2014. Kobani, also known as Ayn Arab, and its surrounding areas, has been under assault by extremists of the Islamic State group since mid-September and is being defended by Kurdish fighters. (AP Photo/Vadim Ghirda)
FILE - In this Monday, Oct. 20, 2014 file photo, thick smoke and flames from an airstrike by the U.S.-led coalition rise in Kobani, Syria, as seen from a hilltop on the outskirts of Suruc, at the Turkey-Syria border. For a force that has built its reputation on projecting an aura of momentum and invincibility, the prolonged stalemate in Kobani is a setback for Islamic State militants with potential implications in terms of recruitment and support. Nearly two months after it launched its lightning assault on the small Kurdish town, the group is bogged down with an increasingly entrenched and costly battle in which hundreds of its fighters have been killed and a good deal of its military apparatus destroyed. (AP Photo, Lefteris Pitarakis, File)
Smoke and flames rise from an Islamic State fighters position in the town of Kobani during airstrikes by the US led coalition, seen from the outskirts of Suruc, near the Turkey-Syria border, Wednesday, Oct. 29, 2014. Kobani, also known as Ayn Arab, and its surrounding areas, has been under assault by extremists of the Islamic State group since mid-September and is being defended by Kurdish fighters. (AP Photo/Vadim Ghirda)
Syrian Kurdish refugees from Kobani watch fighting across the border in Kobani from a hilltop on the outskirts of Suruc, Turkey, near the Turkey-Syria border, Sunday, Oct. 26, 2014. Kobani, also known as Ayn Arab, and its surrounding areas, has been under assault by extremists of the Islamic State group since mid-September and is being defended by Kurdish fighters. (AP Photo/Vadim Ghirda)
Thick smoke and debris rise from an airstrike by the US-led coalition, as light from the explosion is seen, in Kobani, Syria while fighting continued between Syrian Kurds and the militants of Islamic State group, as seen from Mursitpinar on the outskirts of Suruc, at the Turkey-Syria border, Saturday, Oct. 18, 2014. Kobani, also known as Ayn Arab, and its surrounding areas, has been under assault by extremists of the Islamic State group since mid-September and is being defended by Kurdish fighters. (AP Photo/Lefteris Pitarakis)
FILE - In this Oct, 17, 2014, file photo, Syrian Kurdish refugees who fled fighting in Kobani, Syria, go about at a refugee camp in Suruc, on the Turkey-Syria border. Marking a tragic milestone, the United Nations said in a statement on Thursday, July 9, 2015 that over 4 million Syrians have fled to other countries since the outbreak of civil war in their country more than four years ago. (AP Photo/Lefteris Pitarakis, File)
Thick smoke rises following an airstrike by the US-led coalition in Kobani, Syria as fighting continued between Syrian Kurds and the militants of Islamic State group, as seen from Mursitpinar on the outskirts of Suruc, at the Turkey-Syria border, Monday, Oct. 13, 2014. Kobani, also known as Ayn Arab, and its surrounding areas, has been under assault by extremists of the Islamic State group since mid-September and is being defended by Kurdish fighters. (AP Photo/Lefteris Pitarakis)
A Turkish soldier, part of a tank unit holding their position on a hilltop on the outskirts of Suruc, at the Turkey-Syria border, overlooking Kobani, Syria, during fighting between Syrian Kurds and the militants of Islamic State group, walks to members of the media to move them away from the tanks, Monday, Oct. 13, 2014. Kobani, also known as Ayn Arab, and its surrounding areas, has been under assault by extremists of the Islamic State group since mid-September and is being defended by Kurdish fighters. (AP Photo/Lefteris Pitarakis)
Heavy smoke from a fire caused by a military strike rises in Kobani, Syria, as fighting intensified between Syrian Kurds and the militants of Islamic State group, seen from Mursitpinar in the outskirts of Suruc, Turkey, at the Turkey-Syria border, Friday, Oct. 10, 2014. Kobani, also known as Ayn Arab, and its surrounding areas, has been under assault by extremists of the Islamic State group since mid-September and is being defended by Kurdish fighters. (AP Photo/Lefteris Pitarakis)
Protesters and students of Middle East Technical University clash with riot police in Ankara, Turkey, Thursday, Oct. 9, 2014, protesting against the Islamic State group advance on the town of Kobani, Syria, and against the Turkish government. Protests have erupted against Islamic State group advances into the town of Kobani, Syria, and against the limited action by Turkey who have placed military forces to secure the border with Syria but have not engaged with the militants. (AP Photo)
A Turkish Kurd flashes the V-sign to the photographer, on a hilltop on the outskirts of Suruc, at the Turkey-Syria border, as he watches fighting between Syrian Kurds and the militants of the Islamic State group, in Kobani, Syria,Thursday, Oct. 9, 2014. The U.S.-led coalition pounded positions of the Islamic State group in the Syrian border town of Kobani on Thursday in some of the most intensive strikes in the air campaign so far, a Kurdish official and an activist group said. (AP Photo/Lefteris Pitarakis)
A Turkish Kurd watches as airstrikes hit Kobani, inside Syria, as fighting intensifies between Syrian Kurds and the militants of Islamic State group, in Mursitpinar, on the outskirts of Suruc, at the Turkey-Syria border, Wednesday, Oct. 8, 2014. Kobani, also known as Ayn Arab and its surrounding areas have been under attack since mid-September, with militants capturing dozens of nearby Kurdish villages. (AP Photo/Lefteris Pitarakis)
A Turkish Kurd walks at Mursitpinar on the outskirts of Suruc, at the Turkey-Syria border, as smoke from a fire caused by a strike rises over Kobani, inside Syria, as fighting intensifies between Syrian Kurds and the militants of Islamic State group, Wednesday, Oct. 8, 2014. Kobani, also known as Ayn Arab and its surrounding areas have been under attack since mid-September, with militants capturing dozens of nearby Kurdish villages. (AP Photo/Lefteris Pitarakis)
Turkish Kurdish men, standing in the outskirts of Suruc, on the Turkey-Syria border, use binoculars to watch the fighting between militants of the Islamic State group and Kurdish forces in Kobani, Syria, Monday, Oct. 6, 2014. Kobani, also known as Ayn Arab and its surrounding areas have been under attack since mid-September, with militants capturing dozens of nearby Kurdish villages.(AP Photo/Lefteris Pitarakis)
A Turkish soldier carries a young Syrian Kurdish refugee to board a truck near Suruc, Turkey, after the family's arrival from Kobani, as fighting intensified between Syrian Kurds and the militants of Islamic State group, Sunday, Oct. 5, 2014. Kobani, also known as Ayn Arab, is just a few hundred meters inside Syria and its surrounding areas have been under attack since mid-September, with militants capturing dozens of nearby Kurdish villages. (AP Photo/Lefteris Pitarakis)
Turkish soldiers take their positions on a hill top at Mursitpinar near Suruc, at the Turkey-Syria border, overlooking Kobani in Syria as fighting intensified between Syrian Kurds and the militants of Islamic State group, Sunday, Oct. 5, 2014. Kobani and its surrounding areas have been under attack since mid-September, with militants capturing dozens of nearby Kurdish villages. (AP Photo/Lefteris Pitarakis)
Turkish army's armored vehicles stationed near the fighting positions between Syrian Kurds and Islamic State militants, about 10 kilometers in the west of Kobani in Syria, near Suruc, Turkey, Thursday, Oct. 2, 2014. Turkey's parliament approved a motion that gives the government new powers to launch military incursions into Syria and Iraq and to allow foreign forces to use its territory for possible operations against the Islamic State group(AP Photo/Burhan Ozbilici)
This Monday, Oct. 20, 2014 photo, shows a view of Hura, a Bedouin village in the Negev desert, Israel, Monday, Oct. 20, 2014. Othman Abu al-Qiyan, an Israeli Bedouin from Hura, was a quiet whiz kid at the top of his class in Israel who overcome tough odds in this minority Arab village to become a star medical student and hospital intern, until he joined Jihadis and found his death in Syria. Several family members said all they knew is that Abu al-Qiyan left for what he said was a vacation in Turkey with a cousin. In August, they got an anonymous call saying that he had been killed in the first wave of American air raids against the Islamic State. (AP Photo/Tsafrir Abayov)
Smoke rises following an airstrike by the U.S.-led coalition in Kobani, Syria as fighting continues between Syrian Kurds and the militants of Islamic State group, as seen from Mursitpinar, on the outskirts of Suruc, at the Turkey-Syria border, Tuesday, Oct. 14, 2014. Kobani, also known as Ayn Arab, and its surrounding areas, has been under assault by extremists of the Islamic State group since mid-September and is being defended by Kurdish fighters. (AP Photo/Lefteris Pitarakis)
Kurdish Rabia Ali mourns on Saturday, Oct. 11, 2014, at the grave of her son Seydo Mehmud 'Curo' , a Kurdish fighter, who was killed in the fighting with the militants of the Islamic State group in Kobani, Syria, and was buried at a cemetery in Suruc, on the Turkey-Syria border on Tuesday, Oct. 7. Kobani, also known as Ayn Arab, and its surrounding areas, has been under assault by extremists of the Islamic State group since mid-September and is being defended by Kurdish fighters. (AP Photo/Lefteris Pitarakis)
In this image shot with an extreme telephoto lens and through haze from the outskirts of Suruc at the Turkey-Syria border, militants with the Islamic State group are seen after placing their group's flag on a hilltop at the eastern side of the town of Kobani, Syria, where fighting had been intensified between Syrian Kurds and the militants of Islamic State group, Monday, Oct. 6, 2014. Kobani, also known as Ayn Arab and its surrounding areas have been under attack since mid-September, with militants capturing dozens of nearby Kurdish villages. The flag is indicating that the jihadists may have regrouped and broken through the Kurdish lines. (AP Photo/Lefteris Pitarakis)
Turkish soldiers in position a few hundred meters from the border line as fighting intensified between Syrian Kurds and the militants of Islamic State around Kobani in Syria, near Suruc, Turkey, late Friday, Oct. 3, 2014. Turkey's parliament approved Thursday a motion that gives the government new powers to launch military incursions into Syria and Iraq and to allow foreign forces to use its territory for possible operations against the Islamic State group. (AP Photo/Burhan Ozbilici)
SANLIURFA, TURKEY - OCTOBER 10: Heavy smoke from a fire caused by a strike rises in Kobani, Syria as fighting intensified between Syrian Kurds and the militants of Islamic State group, as seen from Mursitpinar in the outskirts of Suruc, at the Turkey-Syria border, October 10, 2014. Kobani, also known as Ayn Arab, and its surrounding areas, has been under assault by extremists of the Islamic State group since mid-September and is being defended by Kurdish fighters. (Photo by Gokhan Sahin/Getty Images)
A Turkish soldier stands on a hill, facing the Islamic State (IS) fighters' new position, 10km west of the Syrian city of Ain al-Arab (Kobane) near the Syrian border at the southeastern town of Suruc in the Sanliurfa province on October 2, 2014. Islamic State fighters were at the gates on October 2 of a key Kurdish town on the Syrian border with Turkey, whose parliament was set to vote on authorising military intervention against the jihadists. Kurdish militiamen backed by US-led air strikes were locked in fierce fighting to prevent the besieged border town of Kobane from falling to IS group fighters. AFP PHOTO/BULENT KILIC (Photo credit should read BULENT KILIC/AFP/Getty Images)
A member of Turkish medical service stands in the southeastern town of Suruc in the Sanliurfa province as Syrian Kurds cross the border between Syria and Turkey on October 1, 2014. Tens of thousands of Syrian Kurds flooded into Turkey fleeing an onslaught by the Islamic State (IS) group that prompted an appeal for international intervention. Some of the refugees now want to return to protect their homes and join the fight against IS militants. AFP PHOTO/BULENT KILIC (Photo credit should read BULENT KILIC/AFP/Getty Images)
SANLIURFA, TURKEY - SEPTEMBER 29: (TURKEY OUT) Border village of Alizar residents keep guard during the night and wait in fear from mortar fired from Islamic State fighters as they tightened their siege of the strategic town of Kobani on Syria's border with Turkey on September 29, 2014 in Sanliurfa, Turkey. Tonight more than 20 mortars hit Turkey's southeastern Turkish town of Suruc in Sanliurfa province. Turkish troops could be used to help set up a secure zone in Syria, if there was an international agreement to establish such a haven for refugees fleeing Islamic State fighters, President Tayyip Erdogan said in comments published on Saturday. Militants still held their positions around 10 kilometres west of Kobane inside Syria, witnesses said, with Kurdish positions the last line of defence between the fighters and the town. Kobane sits on a road linking north and northwestern Syria and Kurdish control of the town has prevented Islamic State fighters from consolidating their gains, although their advance has caused more than 150,000 Kurds to flee to Turkey since last week. (Photo by Stringer/Getty Images)
SANLIURFA, TURKEY - SEPTEMBER 28: Smoke is seen rising from the Syrian Kurdish town of Kobani following an explosion that was followed by further fighting, which saw IS fighters shoot into Turkey for the first time on September 28, 2014 south of Sanliurfa, Turkey. Islamic State (IS, also called ISIS and ISIL) fighters are reportedly advancing with heavy weaponry on the strategic Kurdish border town of Kobani (also called Ayn Al-Arab), which they have surrounded on three sides. Several hundred thousand refugees are reportedly in Kobani and aid agencies are bracing for a massive exodus into Turkey. (Photo by Carsten Koall/Getty Images)
A Kurdish boy stands as another waves to other side near the Syrian border at Suruc in Sanliurfa province, on September 25, 2014. The numbers of Kurdish refugees fleeing into Turkey to escape the advance of Islamic State jihadists in northern Syria has slowed considerably over the last few days, Turkish officials said on September 24.. AFP PHOTO/BULENT KILIC (Photo credit should read BULENT KILIC/AFP/Getty Images)
SANLIURFA, TURKEY - OCTOBER 23: (TURKEY-OUT) Smoke and dust rise over Syrian town of Kobani after an airstrike, as seen from the Mursitpinar crossing on the Turkish-Syrian border in the southeastern town of Suruc in Sanliurfa province, October 23, 2014. The Syrian town of Kobani has yet again seen fierce fighting between Islamic State and Syrian Kurdish forces. Kurdish authorities have agreed to send Peshmerga fighters to the Northern Syrian town to fight ISIL after Turkey has allowed passage. (Photo by Kutluhan Cucel/Getty Images)
ADANA, TURKEY - AUGUST 09: A military aircraft belonging to the United States Air Forces lands on the runway at Incirlik Base in Adana, Turkey on August 9, 2015. Eight military aircrafts belonging to the United States Air Forces were sent to Incirlik Base in Adana as part of the operations against Daesh. (Photo by Volkan Kasik/Anadolu Agency/Getty Images)
ADANA, TURKEY - AUGUST 09: A military aircraft belonging to the United States Air Forces lands on the runway at Incirlik Base in Adana, Turkey on August 9, 2015. Eight military aircrafts belonging to the United States Air Forces were sent to Incirlik Base in Adana as part of the operations against Daesh. (Photo by Volkan Kasik/Anadolu Agency/Getty Images)
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They span the globe

The three biggest feeder countries were Saudia Arabia (797 fighters), Tunisia (640) and Morocco (260), although Tunisia has the highest per capita rate. But they came from all corners of the world — from China (167) to Iceland (1) and Australia (13) to Trinidad and Tobago (2).

About 10 percent hailed from Western nations, including the United Kingdom (57) and the United States (14). In Europe, France (128) and Germany (80) had the highest numbers.

The international nature of the group is cause for concern, giving a glimpse of the ease with which ISIS members might be able to move around and blend in across the globe. Fifty-eight cited the U.S. as a country they had visited.

"They were from all over the world and the individuals had traveled all over the world," Dodwell said. "I wouldn't say a majority of them, but a good number of them were heavily traveled. One individual said he had been to 38 countries around the world. So some of them certainly have international experience and significant experience moving throughout the region and throughout the world."

Each record contained a field where the person processing the paperwork could make notes. The miscellaneous entries were both haphazard and telling. They detailed issues with forged or lost passports, criminal records, health problems, and special family situations.

"Important, he has expertise in chemistry," one notation said. Another: "He has experience in making explosives. He refused to provide his mother's name out of concern for her safety."

The dossiers contain the names of those supposedly vouching for the recruits, and it's clear connections were important.

"His brother executed the metro operations in Madrid," one note said, apparently referring to the 2004 commuter train bombings by an Al Qaeda cell that killed 191 people. A different applicant "tried to join the State through Abu-Ayman al Iraqi [a top ISIS commander killed in 2014] but they refused for lack of recommendation," the file said.

Problems with vision or hearing were duly recorded, along with other medical conditions. "His right leg is amputated," one file said. "He wears a prosthetic."

There were contact numbers for family members and also instructions on whether they were to be contacted. One Spanish fighter left this directive: "He does not want anyone to know."

A college student from Libya who volunteered to be an inghimasi, a type of fighter who plans to die on the battlefield, left a message for those at home: "Tell my mother and my father to forgive me."

The cache included more than 400 exit forms for members who were leaving ISIS territory — the majority were allowed to take a leave of absence for medical treatment, mainly in Turkey, while others were permitted to take care of family issues or bring their families back. But those weren't the only reasons. Two forms contained the word "LIED" in red letters with the ominous warning that the person would be arrested if they returned. In some other cases, ideological differences were noted.

To validate the documents, the West Point center cross-referenced them against a repository of ISIS records maintained by the Defense Department and corroborated about 98 percent.

Dodwell said that while much of the material confirmed the center's understanding of who joins ISIS and why, the "massive amount of diversity" was the biggest eye-opener and poses a challenge for those researching how to counter radical extremism at the root level.

"What it shows us is that it's very difficult to determine who exactly these types of programs should be targeted towards because they come from all walks of life," he said.

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