362nd Training Squadron F-15 crew chief apprentice course students attach a fuel tank to one of the training jets at Sheppard Air Force Base, Texas, August 1, 2018. These tanks add 12,000 pounds of gas to the jet's 13,850 pounds of internal fuel. Although the wait may seem to be a hindrance, it does little to affect the F-15 Eagle's performance. (U.S. Air Force photo by Airman 1st Class Pedro Tenorio)