Col. Devin Pepper assumes command of the 21st Operations Group

PETERSON AIR FORCE BASE, Colo. – Col. Doug Schiess, 21st Space Wing commander, passes the 21st Operation Group guidon to Col. Devin Pepper, 21st Operations Group commander, during the group’s change of command ceremony at Peterson Air Force Base, Colo., May 30, 2017. Pepper assumed command of 21st OG, Air Force Space Command's largest, most weapon-system diverse and geographically separated operations group. The group provides real-time missile warning, attack assessment and space control to the President, Secretary of Defense, Joint Chief of Staff, combatant commands and foreign allies. (U.S. Air Force photo by Senior Airman Dennis Hoffman)

Col. Doug Schiess, 21st Space Wing commander, passes the 21st Operation Group guidon to Col. Devin Pepper, 21st Operations Group commander, during the group’s change of command ceremony at Peterson Air Force Base, Colo., May 30, 2017. Pepper assumed command of 21st OG, Air Force Space Command's largest, most weapon-system diverse and geographically separated operations group. The group provides real-time missile warning, attack assessment and space control to the President, Secretary of Defense, Joint Chief of Staff, combatant commands and foreign allies. (U.S. Air Force photo by Senior Airman Dennis Hoffman)

PETERSON AIR FORCE BASE, Colo. --