U.S. Air Force Airmen from the 6th Civil Engineer Squadron explosive ordnance disposal flight, the 6th Security Forces Squadron and the 927th Aeromedical Staging Squadron ruck march through Avon Park Air Force Range, Fla., Dec. 11, 2019. The Airmen carried rucksacks weighing 35 to 50 pounds during a field training exercise to simulate real-world deployment operations. (U.S. Air Force photo by Airman 1st Class Shannon Bowman)