Senior Airman James Whitehead, 49th Equipment Maintenance Squadron Phase Inspection Section technician, performs a phase inspection on an F-16 Viper, Feb. 22, 2020, on Holloman Air Force Base, N.M. Phase inspections are done on F-16s every 400 flying hours, and are part of the reason why the jets can continue to fly 30 years after they came out the factory. (U.S. Air Force photo by Airman 1st Class Quion Lowe)