TROOP GRATITUDE U.S. Deputy Defense Secretary Ash Carter visits U.S. troops on Kandahar Airfield, Afghanistan, Nov. 29, 2013. Carter thanked the troops for their service during the holiday season, and for their dedication and hard work. SHARE: Download: Full Size (0.05 MB) Credit: VIRIN: 686658-K-SXA17-110.jpg Photo Gallery