U.S. Air Force Reserve Airmen assigned to the 913th Airlift Group, cordon off an inert explosive training aid during “Ability to Survive and Operate” (ATSO) training Nov. 4, 2017, at Little Rock Air Force Base, Ark. Knowing how to cordon an area of a battlefield where unexploded devices are found can prevent injuries to personnel and damage to equipment during combat operations. (U.S. Air Force photo by Master Sgt. Jeff Walston/Released)