U.S. Air Force Master Sgt. Robert Requena; 139th Air Maintenance Squadron dedicated crew chief, replaces a cowl plug on a C-130 Hercules during the Agile Combat Exercise at Joint Base Langley-Eustis, Virginia, Jan. 14, 2021. Cowl plugs protect the aircraft’s intakes from objects entering the open area while it is parked. (U.S. Air Force photo by Staff Sgt. Ericha Fitzgerald)