Senior Airman Vincent Diaz, a reservist in the 419th Aircraft Maintenance Squadron at Hill Air Force Base, Utah, signals an F-35A Lightning II fighter jet pilot during Red Flag 21-1, at Nellis AFB, Nevada, Feb. 8, 2021. Diaz coordinated with the pilot to ensure aircraft systems were functional before their Red Flag mission. (U.S. Air Force photo by Airman 1st Class Dwane R. Young)