CMAFS mechanic
CHEYENNE MOUNTAIN AIR FORCE STATION, Colo. -- Earl Clelland, 721st Civil Engineer Squadron power systems mechanic, leads a tour through Cheyenne Mountain’s power plant which houses six 2,807 horsepower diesel engines. CMAFS is home to the 721st Mission Support Group, which operates, maintains, secures, sustains, mobilizes, tests, and controls the worldwide warning and surveillance system for North America. (U.S. Air Force photo/Staff Sgt. J. Aaron Breeden)