Col. Roderick T. Grunwald assumes command of the 940th Mission Support Group from Col. John Trnka, Jr., 940th Wing commander Aug. 1, 2015 at Dock 6, Beale Air Force Base, Calif. The group consists of 390 reservists assigned to four subordinate units. (U.S. Air Force photo by Staff Sgt. Brenda Davis/Released)

Col. Roderick T. Grunwald, newest 940th Mission Support Group commander, receives applause at a ceremony where he assumed command of the group Aug. 1, 2015 at Dock 6, Beale Air Force Base, Calif. (U.S. Air Force photo by Staff Sgt. Brenda Davis/Released)

Technical Sgt. Peter Thompson holds the guide in anticipation of the ceremony where Col. Roderick T. Grunwald assumes command of the 940th Mission Support Group from Col. John Trnka, Jr., 940th Wing commander. The ceremony is a military tradition that represents the formal transfer of authority and responsibility from one commander to another. (U.S. Air Force photo by Staff Sgt. Brenda Davis/Released)