DYESS AIR FORCE BASE, Texas – Col. David Been, 7th Bomb Wing commander, officiates the 7th Mission Support Group change of command ceremony where Lt Col. Kristina O’Brien assumes command of the group at the parade grounds here, July 25. The change of command is a military ceremony in which the departing commander assembles his troops for presentation to the incoming commander. The ceremony serves to inform the assembled Airmen that they must respond to the leadership of the new commander. (U.S. Air Force photo by Senior Airman Chelsea Browning/Released)