362nd Training Squadron F-16 crew chief apprentice course students end their duty day at Sheppard Air Force Base, Texas, Oct. 30, 2018. The Airmen just finished torquing the forward attach fitting on the wing, which secures the wing tank and its contents of over 3,000 pounds of gas for the jet. The Airmen are now putting away their tools after a job well done. (U.S. Air Force photo by Airman 1st Class Pedro Tenorio)