COLORADO SPRINGS, Colo. -- COLORADO SPRINGS, Colo. – U.S. Space Force (USSF) Col. Margaret “Maggie” Sullivan assumed command of System Delta 81, the Space Systems Command (SSC) unit responsible for delivering test and training infrastructure, during a change of command ceremony at Peterson Space Force Base on Aug. 6. As part of a time-honored tradition symbolizing the formal transfer of authority, USSF Col. Richard Beckman, portfolio acquisition executive (PAE) for Infrastructure, presented the System Delta 81 guidon to Sullivan, who assumes the role initiated by USSF Col. Corey Klopstein, outgoing SYD 81 commander and PAE for Infrastructure.