Airman David Cochennic, left, 365th Training Squadron fighter avionics apprentice course student, watches as instructor Tech. Sgt. Allen Orr shows him how to turn on an F-16 test station at Sheppard Air Force Base, Texas, Dec. 12, 2018. These technicians are often reffered to as backshop avionics. They will remove any malfunctioning parts from the aircraft on the flightline and bring it back to this machine to determine what is wrong with it, then send it back. (U.S. Air Force photo by Airman 1st Class Pedro Tenorio)