PETERSON AIR FORCE BASE, Colo. – Col. Todd Moore (left), 21st Space Wing commander passes the 21st Medical Group guidon to Col. Christopher Vaughn (right) 21 MDG incoming commander, who assumed command June 14, 2018. The ceremony was held at the Edward J. Peterson Air and Space Museum on Peterson Air Force Base, Colorado. (U.S. Air Force photo by Craig Denton)