A U.S. Army CH-47 Chinook helicopter transporting wounded veterans participating in Operation Proper Exit arrives at Camp Nathan Smith in Kandahar province, Afghanistan, Feb. 27, 2013. Operation Proper Exit is an initiative of the Troops First Foundation and the USO that allows injured veterans to bring closure to their service. (U.S. Army photo by Sgt. 1st Class Joseph Wilbanks/Released)