U.S. Space Force Lt. Gen. Stephen Whiting, Space Operations Command commander, left, passes the Space Delta 2 guidon to U.S. Space Force Col. Mark Brock at a change of command ceremony at Peterson Air Force Base, Colorado, June 14, 2021. As the new commander of Space Delta 2 – Space Domain Awareness, Brock became responsible for overseeing DEL 2 operations and executing combat-ready Space Domain Awareness. SDA operations have been the key to deter aggression and, if necessary, defend the U.S. and its allies from attacks in, through and from space.