May 8, 2026 AFMS leader Maj. Gen. Sean T. Collins retires after 31 years of service After 31 years of military service, U.S. Air Force Maj. Gen. Sean T. Collins, Air National Guard assistant to the Surgeon General and director of Space Force Medical Operations Directorate, retired during a ceremony at Joint Base Anacostia-Bolling, Washington, D.C., May 1, 2026.