Staff Sgt. Erick Jensen, 28th Civil Engineer Squadron electronic systems technician, and Master Sgt. Rheiff Mikonen, 28th Logistics Readiness Squadron fields information service center section chief, replace an old and damaged low level fuel alarm system on a fuel tank on Ellsworth Air Force Base, S.D., Dec. 28, 2011. Fuel from the tanks is used to refuel the base’s B1-B fleet. (U.S. Air Force photo by Airman 1st Class Zachary Hada/Released)