A maintainer with the 79th Fighter Squadron (FS), Shaw Air Force Base, South Carolina, performs a preflight check on an F-16 Fighting Falcon aircraft at MacDill Air Force Base, Florida, Sept. 8, 2021. The F-16 is a single-engine, compact, multi-role fighter and is the world’s most prolific fighter, with the U.S. Air Force having over 2,000 in service. (U.S. Air Force photo by Airman 1st Class Hiram Martinez)