U.S. to deploy 560 more troops to Iraq, Defense Secretary Ash Carter says

Ash Carter Arrives in Iraq amid Effort to Retake Mosul from ISIS

BAGHDAD — The U.S. will deploy an additional 560 troops to Iraq, Defense Secretary Ash Carter said Monday.

Carter made the announcement during an unannounced visit to Baghdad, saying the troops will deploy for infrastructure and logistical support at Qayara airfield south of Mosul.

Iraqi forces recaptured the strategically-located base on Saturday from ISIS. The airfield could prove a critical asset in the impending operation to wrest Mosul from ISIS' grip.

The fight for Mosul was described by one senior defense official ahead of Carter's trip as "the fight for Iraq... the culminating battle."

President Barack Obama has approved the additional deployment announced Monday, which will bring the total number of U.S. servicemen in Iraq to around 4,600.

RELATED: Photos of U.S. troops in Iraq

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US troops in Iraq (u.s.) updated
TAJI, IRAQ - APRIL 12: A U.S. Army trainer (L), instructs Iraqi Army recruits at a military base on April 12, 2015 in Taji, Iraq. U.S. forces, currently operating in 5 large bases throught Iraq, are training thousands of Iraqi Army combat troops, trying to rebuild a force they had origninally trained before the U.S. withdrawal from Iraq in 2010. Members of the U.S. Army's 5-73 CAV, 3BCT, 82nd Airborne Division are teaching members of the newly-formed 15th Division of the Iraqi Army, as the Iraqi government launches offensives to try to recover territory lost to ISIS last year. (Photo by John Moore/Getty Images)
TAJI, IRAQ - APRIL 12: Iraqi Army recruits listen to a U.S. Army trainer (R), at a military base on April 12, 2015 in Taji, Iraq. U.S. forces, currently operating in 5 large bases throught the country, are training thousands of Iraqi Army combat troops, trying to rebuild a force they had origninally trained before the U.S. withdrawal from Iraq in 2010. Members of the U.S. Army's 5-73 CAV, 3BCT, 82nd Airborne Division are teaching members of the newly-formed 15th Division of the Iraqi Army, as the Iraqi government launches offensives to try to recover territory lost to ISIS last year. (Photo by John Moore/Getty Images)
TAJI, IRAQ - APRIL 12: A U.S. Army trainer (R), instructs an Iraqi Army recruit at a military base on April 12, 2015 in Taji, Iraq. U.S. forces, currently operating in 5 large bases throught the country, are training thousands of Iraqi Army combat troops, trying to rebuild a force they had origninally trained before the U.S. withdrawal from Iraq in 2010. Members of the U.S. Army's 5-73 CAV, 3BCT, 82nd Airborne Division are teaching members of the newly-formed 15th Division of the Iraqi Army, as the Iraqi government launches offensives to try to recover territory lost to ISIS last year. (Photo by John Moore/Getty Images)
American military trainers show Iraqi soldiers how to use American weapons during a training session at the Taji base complex, which hosts Iraqi and US troops, located 30 kilometres north of the capital Baghdad on January 7, 2015. American and allied soldiers are aiming to rapidly train thousands of Iraqi security personnel in the 'bare minimum basics' needed to join the fight against militants who swept Baghdad's troops aside. The first round of training is just getting underway at the massive Taji base complex north of Baghdad, one of five planned training sites. AFP PHOTO/ AHMAD AL-RUBAYE (Photo credit should read AHMAD AL-RUBAYE/AFP/Getty Images)
CAMP BUEHRING, KUWAIT - DECEMBER 08: U.S. troops stand at attention next to a Abrams tank waiting for the arrival of Secretary of Defense Chuck Hagel, December 8, 2014 at Camp Buehring, Kuwait. Secretary Hagel visited the camp which once was a staging post for troops headed to Iraq. (Photo by Mark Wilson/Getty Images)
TAJI, IRAQ - APRIL 12: A U.S. Army trainer (L), speaks with an Iraqi Army officer at a military base on April 12, 2015 in Taji, Iraq. U.S. forces, currently operating in 5 large bases throught Iraq, are training thousands of Iraqi Army combat troops, trying to rebuild a force they had origninally trained before the U.S. withdrawal from Iraq in 2010. Members of the U.S. Army's 5-73 CAV, 3BCT, 82nd Airborne Division are teaching members of the newly-formed 15th Division of the Iraqi Army, as the Iraqi government launches offensives to try to recover territory lost to ISIS last year. (Photo by John Moore/Getty Images)
American trainers take a break as they train Iraqi soldier on approaching and clearing buildings at the Taji base complex, which hosts Iraqi and US troops and is located north of the capital Baghdad, on January 7, 2015. Taji is one of an eventual five sites from which the US and allied countries aim to train 5,000 Iraqi military personnel every six to eight weeks for combat against the Islamic State (IS) jihadist group. AFP/ PHOTO/AHMAD AL-RUBAYE (Photo credit should read AHMAD AL-RUBAYE/AFP/Getty Images)
American and Iraqi trainers watch on as an Iraqi soldier rebuilds his weapon at the Taji base complex, which hosts Iraqi and US troops and is located north of the capital Baghdad, on January 7, 2015. Taji is one of an eventual five sites from which the US and allied countries aim to train 5,000 Iraqi military personnel every six to eight weeks for combat against the Islamic State (IS) jihadist group. AFP/ PHOTO/AHMAD AL-RUBAYE (Photo credit should read AHMAD AL-RUBAYE/AFP/Getty Images)
An American military trainer instructs Iraqi soldier during an exercise on approaching and clearing buildings at the Taji base complex, which hosts Iraqi and US troops and is located north of the capital Baghdad, on January 7, 2015. Taji is one of an eventual five sites from which the US and allied countries aim to train 5,000 Iraqi military personnel every six to eight weeks for combat against the Islamic State (IS) jihadist group. AFP PHOTO/ AHMAD AL-RUBAYE (Photo credit should read AHMAD AL-RUBAYE/AFP/Getty Images)
An American military trainer instructs an Iraqi soldier during an exercise on approaching and clearing buildings at the Taji base complex, which hosts Iraqi and US troops and is located north of the capital Baghdad, on January 7, 2015. Taji is one of an eventual five sites from which the US and allied countries aim to train 5,000 Iraqi military personnel every six to eight weeks for combat against the Islamic State (IS) jihadist group. AFP PHOTO/ AHMAD AL-RUBAYE (Photo credit should read AHMAD AL-RUBAYE/AFP/Getty Images)
BAGHDAD, IRAQ - DECEMBER 09: U.S. troops are silhouetted as they listen to U.S. Secretary of Defense Chuck Hagel speak during a visit to Baghdad International Airport, December 9, 2014 in Baghdad, Iraq. Secretary Hagel later met with Iraqi military officials and Prime Minister Haider al-Abadi. (Photo by Mark Wilson/Getty Images)
TO GO WITH AFP STORY BY W.G. DUNLOP An American soldier stands guard at the Taji base complex which hosts Iraqi and US troops and is located thirty kilometres north of the capital Baghdad on December 29, 2014. Taji is one of an eventual five sites where the US and allied countries aim to train 5,000 Iraqi military personnel every six to eight weeks for combat against the Islamic State (IS) jihadist group. AFP PHOTO / ALI AL-SAADI (Photo credit should read ALI AL-SAADI/AFP/Getty Images)
An American trainer instructs an Iraqi soldier on approaching and clearing buildings at the Taji base complex, which hosts Iraqi and US troops and is located north of the capital Baghdad, on January 7, 2015. Taji is one of an eventual five sites from which the US and allied countries aim to train 5,000 Iraqi military personnel every six to eight weeks for combat against the Islamic State (IS) jihadist group. AFP/ PHOTO/AHMAD AL-RUBAYE (Photo credit should read AHMAD AL-RUBAYE/AFP/Getty Images)
CAMP BUEHRING, KUWAIT - DECEMBER 08: U.S. troops listen to Secretary of Defense Chuck Hagel speak during a visit, December 8, 2014 at Camp Buehring, Kuwait. Secretary Hagel visited the camp which once was a staging post for troops headed to Iraq. (Photo by Mark Wilson/Getty Images)
TO GO WITH AFP STORY BY W.G DUNLOP A US soldier stands in front of graffiti painted on concrete blast walls at the Taji base complex which hosts Iraqi and US troops and is located thirty kilometres north of the capital Baghdad, on December 29, 2014. Taji is one of an eventual five sites where the US and allied countries aim to train 5,000 Iraqi military personnel every six to eight weeks for combat against the Islamic State (IS) jihadist group. AFP PHOTO / ALI AL-SAADI (Photo credit should read ALI AL-SAADI/AFP/Getty Images)
BAGHDAD, IRAQ - DECEMBER 09: U.S. troops listen to U.S. Secretary of Defense Chuck Hagel speak during a visit to Baghdad International Airport, December 9, 2014 in Baghdad, Iraq. Secretary Hagel later met with Iraqi military officials and Prime Minister Haider al-Abadi. (Photo by Mark Wilson/Getty Images)
BAGHDAD, IRAQ - DECEMBER 09: U.S. Secretary of Defense Chuck Hagel speaks to troops stationed at Baghdad International Airport, December 9, 2014 in Baghdad, Iraq. Secretary Hagel later met with Iraqi military officials and Prime Minister Haider al-Abadi. (Photo by Mark Wilson/Getty Images)
An F/A-18C hornet pilot poses on the flight deck of the US navy aircraft carrier USS George H.W. Bush on August 15, 2014 in the Gulf. The US aircraft carrier is supporting maritime security operations and theater security cooperation efforts in the US 5th Fleet area of responsibility. AFP PHOTO/MOHAMMED AL-SHAIKH (Photo credit should read MOHAMMED AL-SHAIKH/AFP/Getty Images)
KHAZIR FRONTLINE, KRG, IRAQ - 2014/08/26: An American Humvee is potionned on the Khazir Frontline. It was captured from ISIS militants by Peshmerga soldiers. Khazir refugee camp is located outside Kalak, a town halfway on the road between Erbil and Mosul. It was overrun by ISIS militants on the 7th of August following an unprecedented push of the Caliphate into Kurdish territory. Its thousands of Iraqi and Arab refugees were forced to flee again as the now deserted camp has become the new frontline between the Peshmerga and ISIS. It is the theatre of frequent U.S. airstrikes that have helped halt the ISIS advance into a stalemate situation. (Photo by Vianney Le Caer/Pacific Press/LightRocket via Getty Images)
A Kurdish Peshmerga fighter, with an image of the US flag sewn onto his shirt sleeve, stands next to an ambulance destroyed due to an improvised explosive device (IED) in Hossein, during the clashes on the road to Jalawla, on August 23, 2014. The United States launched an air campaign against IS in Iraq on April 8, and has since carried out more than 90 strikes that have largely been in support of Kurdish forces in the north, drawing calls for operations elsewhere in the country. AFP PHOTO / JM LOPEZ (Photo credit should read JM LOPEZ/AFP/Getty Images)
MAKHMOUR, KRG, IRAQ - 2014/08/18: A Peshmerga soldier looks away from the top of an American MRAP vehicle while the Kurdish flags floats. Makhmour is a town 50 kilometers South of Erbil, the capital of the Kurdistan Regional Government. After an ISIS offensive, the town fell to the Caliphate on the 8th of August but taken back by the Peshmerga and PKK fighters on August 10. All people deserted the town and only 10% decided to return. (Photo by Vianney Le Caer/Pacific Press/LightRocket via Getty Images)
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