Airmen from the 193rd Special Operations Civil Engineer Squadron remove gear that is simulated to be contaminated during an exercise Oct. 4 at the Fort Indiantown Gap Regional Training Site in Annville, Pennsylvania. The annual bivouac exercise helps power production and operations personnel, as well as emergency managers and firefighters learn how to master their skills and accomplish their mission under austere field conditions that may include chemical, biological, radiological, nuclear and environmental threats. (U.S. Air National Guard photo by Staff Sgt. Susan Penning/Released)