RUCK MARCH U.S. airmen check for threats during a tactical reload drill on Misawa Air Base, Japan, Jan. 8, 2010. The drill was part of a four-mile ruck march, an event in which troops maintain a fast pace carrying at least 45 pounds over rough terrain. The airmen are assigned to the 35th Civil Engineer Squadron Explosive Ordnance Disposal flight. SHARE: Download: Full Size (0.08 MB) Credit: VIRIN: 261080-D-EOA67-897.jpg Photo Gallery