Fuel cell
Senior Airman Jonathan Bradey, 28th Maintenance Squadron fuel systems journeyman, prepares a liquid quantity caging interface unit during fuel level testing inside the fuel cell hangar at Ellsworth Air Force Base, S.D., Nov. 8, 2012. Specialists use the LQCI to test internal probes and wires that measure fuel levels inside fuel tanks. (U.S. Air Force photo by Airman 1st Class Anania Tekurio)