A U.S. Army National Guardsman crawls under an obstacle during air assault school. A U.S. Army National Guardsman crawls under an obstacle during air assault school at Camp Blanding Joint Training Center, Fla., on Feb. 15, 2011. More than 200 soldiers and airmen participated in the two-week course, which is focused on teaching combat assault operations involving helicopters. SHARE: Download: Full Size (0.09 MB) Credit: VIRIN: 462984-M-YSN00-220.jpg Photo Gallery