Operation Group Members from the Air Force 436th Operation Group stand in formation during a change-of-command ceremony at Dover Air Force Base, Del., July 29, 2019. A change of command is a military tradition in which one commanding officer transfers responsibility and authority to another. SHARE: Download: Full Size (1.38 MB) Tags: air force Credit: Air Force Senior Airman Christopher Quail VIRIN: 190729-F-NX530-1042D.JPG Photo Gallery