Airmen from F.E. Warren Air Force Base, Wyo., practice tactically clearing a room on the fourth day of a 10-day annual nuclear-convoy training exercise at Camp Guernsey, Wyo., Oct. 18, 2012. Security forces airmen are preparing for a rolling convoy which will evaluate their response to the theft of a nuclear device by hostile forces. (U.S. Air Force photo by Airman 1st Class Kayla Newman/Released)