U.S. Air Force Senior Airman Connor Mortellaro, 7th Logistics Readiness Squadron fuels distribution operator, connects a refueling unit to a fuels hydrant outlet on the flightline April 21, 2016, at Dyess Air Force Base, Texas. There are three types of refueling unit used by fuels distribution section: the R-11, which is for both B-1B Lancers and C-130J Super Hercules, the R-12, for B-1Bs only, and the C-300, for government vehicles and equipment. (U.S. Air Force photo by Airman 1st Class Rebecca Van Syoc/Released)