821st ABG change of command
THULE AIR BASE, Greenland – Col. Chris Crawford, 21st Space Wing commander (left), presents the 821st Air Base Group guidon to Lt. Col William Uhlmeyer, 821st ABG commander, during a change of command ceremony July 21, 2011. Thule AB is one of the six installations operated by the 21st Space Wing, and is located 750 miles north of the Arctic Circle. (Courtesy photo)