A 362nd Training Squadron F-15 crew chief apprentice course student works on a radar at Sheppard Air Force Base, Texas, Nov. 29, 2018. The radar used in the F-15s at Sheppard are an A model, older models that are static, non-moving pieces. There are still some F-15s in service that use these A model radars, but are slowly being replaced by the more fancier rotating radars. (U.S. Air Force photo by Airman 1st Class Pedro Tenorio)