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Lt. Col. Matthew Olson, right, outgoing 436th Civil Engineer Squadron commander, relinquishes command of the 436th CES to Col. Phelemon Williams, left, 436th Mission Support Group commander, during a change of command ceremony held at the base fire station on Dover Air Force Base, Delaware, June 23, 2022. Team Dover Airmen, family members and guests watched Olson relinquish command to Lt. Col. Joshua Yerk. Guidon bearer for the ceremony was Chief Master Sgt. Andrew Kehl, center, 436th CES fire chief. (U.S. Air Force photo by Roland Balik)