see more

BAGRAM AIR BASE, AFGHANISTAN - MAY 11: U.S. Army soldiers walk to their C-17 cargo plane for departure May 11, 2013 at Bagram Air Base, Afghanistan. U.S. soldiers and marines are part of the NATO troop withdrawal from Afghanistan, to be completed by the end of 2014. (Photo by Robert Nickelsberg/Getty Images)

BAGRAM AIR BASE, AFGHANISTAN - MAY 11: U.S. Army soldiers walk to their C-17 cargo plane for departure May 11, 2013 at Bagram Air Base, Afghanistan. U.S. soldiers and marines are part of the NATO troop withdrawal from Afghanistan, to be completed by the end of 2014. (Photo by Robert Nickelsberg/Getty Images)