U.S. Defense Secretary Ash Carter shakes hands with U.S. Army Gen. John F. Campbell, commander of U.S. forces in Afghanistan and Operation Resolute Support, after visiting troops on Kandahar Airfield, Afghanistan Feb. 22, 2015. U.S. Defense Secretary Ash Carter shakes hands with U.S. Army Gen. John F. Campbell, commander of U.S. forces in Afghanistan and Operation Resolute Support, after visiting troops on Kandahar Airfield, Afghanistan Feb. 22, 2015. SHARE: Download: Full Size (0.87 MB) Tags: Photo Essays Credit: VIRIN: 824163-S-VGO65-536.jpg Photo Gallery