In a 2019 file photo, U.S. Air Force Col. Shane Clark, senior materiel leader from the Space and Missile Systems Center’s Launch Enterprise Systems Directorate, and chief of the Atlas V and Delta IV division, runs through a countdown checklist during a mission dress rehearsal at Cape Canaveral Air Force Station, along Florida's Space Coast. As mission director for the U.S. Space Force launch of USSF-7 and the X-37B Orbital Test Vehicle, Col. Clark will ensure the integrated launch team from SMC Launch Enterprise and mission partners United Launch Alliance, Aerospace Corporation, the Boeing space vehicle team and the 45th Space Wing with a data-driven, attention-to-detail focus, and give the final “Go” for launch. (U.S. Air Force photo/Van De Ha)