Airman 1st Class Katelyn Dittmer, left, and Airman 1st Class Jacob Heppler fuel distribution operators with the 436th Logistics Readiness Squadron, pump fuel into an aircraft March 23, 2012, on the Dover Air Force Base, Del., flightline. Fuel is pumped from pump houses on base through underground pipelines to the flightline. From there, fuel trucks pump the fuel from the pipeline into the aircraft. (U.S. Air Force photo/Roland Balik)