Secretary of Defense, Chuck Hagel, shakes hands with U.S. Army military policemen, thanking them for their support during his trip to Kabul, Afghanistan, March 11, 2013. Hagel traveled to Afghanistan on his first trip as the 24th Secretary of Defense to visit U.S. Troops, NATO leaders, and Afghan counterparts. (Photo by Erin A. Kirk-Cuomo/Department of Defense/Sipa USA)