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U.S. Air Force Senior Master Sgt. Alexander Alexander, 30th Security Forces Squadron first sergeant, right, Senior Airman Luis Stephenson, 30 SFS patrolman, middle, Airman 1st Class Christian Brown, 30 SFS patrolman, back left, and Senior Airman Estrella Encinas, 30 SFS patrolman, greet a base member during a security checkpoint at Vandenberg Space Force Base, Calif., May 28, 2026. Alexander has served as an aircraft maintainer, military training instructor, and many other assignments across other mission sets. First sergeants, also known under the alias of “first shirts" or just “shirts,” fulfill a critical senior enlisted leadership position in their unit, and are often described as “Swiss Army knives” due to their versatility. (U.S. Space Force photo by Staff Sgt. Kevin Hernandez)