U.S. Air Force Staff Sgt. Trent Skidmore, 633d Security Forces Squadron installation entry controller, gathers grass to cover a defensive fighting position during a bivouac exercise at Joint Base Langley-Eustis, Virginia, Oct. 15, 2024. A DFP makes use of available cover and concealment to maximize the protection of individuals manning it. (U.S. Air Force photo by Senior Airman Ian Sullens)