Master Sgt. Joseph Coffey, an aero repair technician assigned to the 439th Maintenance Squadron, works on a ball screw drive assembly on a C-5M Super Galaxy August 23, 2017, in the Isochronal (ISO) Maintenance Dock at Westover Air Reserve Base, Mass. In July 2017, a nose gear problem led leadership at Dover Air Force Base, Delaware, to issue a stand-down of their assigned C-5s. This grounding evolved into a fleet-wide issue while maintenance crews made the necessary repairs to the nose-gear ball screw drive assemblies. (U.S. Air Force photo by Airman Hanna N. Smith)