A U.S. soldier prepares his .50-caliber machine gun before moving out on a security mission for a bridge being built in Paktya province, Afghanistan, Aug. 31, 2013. A U.S. soldier prepares his .50-caliber machine gun before moving out on a security mission for a bridge being built in Paktya province, Afghanistan, Aug. 31, 2013. SHARE: Download: Full Size (1.11 MB) Tags: Photo Essays Credit: VIRIN: 132909-P-VXB41-321.jpg Photo Gallery