WASHINGTON, DC - MAY 29: Staff Sgt. Tim Chambers, the saluting Marine, kisses his bride Lorraine Heist during the annual Rolling Thunder First Amendment Demonstration Run May 29, 2016 in Washington, DC. Each year Chambers stands on the route at attention to salute the passing bikers. Bikers are gathering in the annual parade in the nation's capital to remember those who were prisoners of war and missing in action on Memorial Day weekend. (Photo by Alex Wong/Getty Images)
APPLEBY, ENGLAND - JUNE 02: A traveller washes his horse in the River Eden during the Appleby Horse Fair on June 2, 2016 in Appleby, England. The Appleby Horse Fair has existed under the protection of a charter granted by James II since 1685 and is one of the key gathering points for the Romany, gypsy and traveling community. The fair is attended by about 5,000 travellers who come to buy and sell horses. The animals are washed and groomed in the River Eden before being ridden at high speed along the 'mad mile' for the viewing of potential buyers. (Photo by Christopher Furlong/Getty Images)
IZMIR, TURKEY - MAY 30: Combat helicopters are in action during the Efes-2016 Combined Joint Live Fire Exercise at Seferihisar district of Izmir, Turkey on May 31, 2016. The Turkish-led multinational military exercises, Efes-2016 which started at 04 May and will be finished at 04 June 2016, aims to train participating units and staff in planning and conducting combined and joint operations, including logistics and command-control as well as to improve the level of interoperability among headquarters and forces. (Photo by Evren Atalay/Anadolu Agency/Getty Images)
WASHINGTON, DC - JUNE 01: U.S. President Barack Obama passes by the Rose Garden prior to his departure from the White House June 1, 2016 in Washington, DC. President Obama is heading to Elkhart, Indiana, where he made his first domestic trip as president in 2009, to discuss the economy. (Photo by Alex Wong/Getty Images)
RECIFE, BRAZIL - MAY 31: David Henrique Ferreira, 9-months-old, who was born with microcephaly, is tested with new glasses as his mother Mylene (L) sits by on May 31, 2016 in Recife, Brazil. Microcephaly is a birth defect linked to the Zika virus where infants are born with abnormally small heads. Vision problems have been reported in some of the infants as well. The city of Recife and surrounding Pernambuco state remain the epicenter of the Zika virus outbreak, which has now spread to many countries in the Americas. A group of health experts recently called for the Rio 2016 Olympic Games to be postponed or cancelled due to the Zika threat but the WHO (World Health Organization) rejected the proposal. The Olympic torch passed through Recife today. (Photo by Mario Tama/Getty Images)
ARLINGTON, VA - MAY 31: Great grandniece Madeline Brumbaugh of Springfield, Virginia, watches doves flying away as the birds are being released during the burial of Private First Class James Bernard Johnson May 31, 2016 at Arlington National Cemetery in Arlington, Virginia. Johnson was assigned to Company K, 3rd Battalion, 8th Marines, 2nd Marine Division during WWII. He died sometime on the first day of battle against the Japanese, November 20, 1943, in an attempt to secure the small island of Betio in the Tarawa Atoll of the Gilbert Islands after landing. (Photo by Alex Wong/Getty Images)
ANNAPOLIS, MD - MAY 27: U.S. Naval Academy graduates toss their hats in the air during graduation ceremonies at the U.S. Naval Academy May 27, 2016 in Annapolis, Maryland. This is the first year that females wore the same uniform as the males. U.S. Secretary of Defense Ashton Carter was this year's commencement speaker. (Photo by Mark Wilson/Getty Images)
BRAUNSBACH, GERMANY - MAY 30: A man looks at cars smashed among debris following a furious flash flood the night before on May 30, 2016 in Braunsbach, Germany. The flood tore through Braunsbach, crushing cars, ripping corners of houses and flooding homes during a storm that hit southwestern Germany. Miraculously no one in Braunsbach was killed, though three people died as a result of the storm in other parts of the country. (Photo by Sean Gallup/Getty Images)
MOSUL, IRAQ - MAY 29 : Smoke rises after coalition forces' aircrafts hit Daesh targets during an operation led by Peshmerga forces against Daesh during an operation in Hazer region Mosul, Iraq on May 29, 2016. (Photo by Hemn Baban/Anadolu Agency/Getty Images)
Democratic Party candidate Bernie Sanders gestures while speaking to his supporters on May 27, 2016 in the San Pedro port district of Los Angeles, California, ahead of the June 7 California vote. / AFP / FREDERIC J. BROWN (Photo credit should read FREDERIC J. BROWN/AFP/Getty Images)
WASHINGTON, DC - MAY 27: A couple views a large American flag set up on the National Mall, May 27, 2016, in Washington, DC. Rolling Thunder members and supporters will participate in a motorcycle rally on Sunday afternoon in Washington. Rolling Thunder is an advocacy group that seeks to bring awareness to prisoners of war (POWs) and missing in action (MIA) service members of all U.S. wars. (Photo by Drew Angerer/Getty Images)
Pro-government forces fighters celebrate in the al-Sejar village, in Iraq's Anbar province, on May 27, 2016, as they take part in a major assault to retake the city of Fallujah, from the Islamic State (IS) group.
Hundreds of people fled the Fallujah area with the help of Iraqi forces who are fighting to retake the city from the Islamic State jihadist group, officials said.
Iraqi forces launched an operation to recapture Fallujah, an IS stronghold located just 50 kilometres (30 miles) west of Baghdad, at the start of this week.
/ AFP / AHMAD AL-RUBAYE (Photo credit should read AHMAD AL-RUBAYE/AFP/Getty Images)
TOPSHOT - A frozen food item hits a girl in the face after republican presidential candidate Donald Trump finished speaking at a nearby rally in Fresno, California on May 27, 2016. / AFP / JOSH EDELSON (Photo credit should read JOSH EDELSON/AFP/Getty Images)