Stock Photo Description: U.S. Air Force basic trainees low-crawl through a tactical course during a field training exercise at Lackland Air Force Base, Texas, Aug. 10, 2006. During this portion of training, the Airmen are required to evacuate their base following a simulated attack by low crawling across 90-yards of sand and navigating a tactical course to reach the next safe point. (U.S. Air Force photo by Robbin Cresswell) (Released)