U.S. Air Force Airman 1st Class Dontrelle Pennington, 633d Communications Squadron cyber security technician, left, and Staff Sgt. Gerell Johnson, 633d Contracting Squadron contract specialist dig a defensive fighting position during a bivouac exercise at Joint Base Langley-Eustis, Virginia, Oct. 15, 2024. A DFP must be at least deep enough that the tallest occupants can stand with only their head exposed. (U.S. Air Force photo by Senior Airman Ian Sullens)