Col. Ronald Allen, Jr., 90th Operations Group commander, passes the 37th Helicopter Squadron guidon to Lt. Col. Todd Ivener as he assumes command of the squadron during a change-of-command ceremony June 2, 2014, in the helicopter hangar in Building 1250 on F.E. Warren Air Force Base, Wyo. Prior to his command, Ivener was the 37th HS's director of operations. (U.S. Air Force photo by Airman 1st Class Jason Wiese)