Master Sgt. Richard Titcomb, 339th Flight Test Squadron C-5 flight engineer, performs pre-flight checks to a C-5M Super Galaxy March 29, 2017, at Robins Air Force Base, Ga. The check was part of the functional test stage of the aircraft’s programmed depot maintenance, a process designed to ensure aircraft are safe and mission ready. (U.S. Air Force photo by Jamal D. Sutter)