PETERSON AIR FORCE BASE, Colo. –Staff Sgt. Jason Allred and Senior Airman Genevieve McGeary, 21st Civil Engineer Squadron electricians, troubleshoot the lights on the canopy at the gas station Dec. 9, 2015. Part of the mission of the 21st CES is to maintain, repair and construct essential facilities and utility infrastructure systems to include electrical power systems, water and natural gas distribution systems and base roads and pavements. (U.S. Air Force photo by Senior Airman Rose Gudex)