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 339th is responsible for conducting flight tests on F-15s, C-130s and C-5s once programmed depot maintenance is completed. (U.S. Air Force photo by Jamal D. Sutter)