SYSTEM CHECK U.S. Army Spc. Carlos Tapia checks a crew system equipped with a machine gun before convoy operations on Kandahar Airfield, Afghanistn, July 30, 2013. Tapia is assigned to Alpha Troop, Regimental Support Squadron, Combined Force Dragoon, which provided security during the operation. SHARE: Download: Full Size (0.03 MB) Credit: VIRIN: 084716-R-BTW66-306.jpg Photo Gallery