Staff Sgt. Caleb Shackelford, 22nd Space Operations Squadron defensive counter-space operator, monitors the Air Force Satellite Control Network link protection system to detect and investigate abnormal signals that could impact the AFSCN and its users, at Schriever Air Force Base, Colorado, Dec. 16, 2019. Shackelford is the first Airman assigned to this position, which was stood up in 2016. (U.S. Air Force photo by Airman 1st Class Jonathan Whitely)