U.S. Air Force Staff Sgt. Tristan Short, 20th Logistics Readiness Squadron (LRS) ground transportation craftsman, right, certifies Airman 1st Class Eric Michael, 20th LRS ground transportation apprentice, on bus mechanics at Shaw Air Force Base, S.C., June 12, 2017. Ground transportation Airmen are certified on inspecting and operating various vehicles throughout their careers to include buses, vans and flatbed trailers. (U.S. Air Force photo by Airman 1st Class Christopher Maldonado)