JOINT BASE LANGLEY-EUSTIS, Va.— U.S. Air Force Staff Sgt. Jonathan King, 633d Communications Squadron cable and antenna systems journeyman, points out how Airmen monitor oxygen levels in the manholes on Joint Base Langley-Eustis, Virginia, June 11, 2024. Airmen explained safety measures that are in place, which included safety harnesses, oxygen meters and other personal protection equipment. (U.S. Air Force photo by Staff Sgt. Bennett Hibbler, Jr.)