PORTSMOUTH, Va. (March 3, 2020) Capt. Lisa Mulligan, commanding officer of Naval Medical Center Portsmouth, relieves Capt. Kenneth L. McAndrews Jr. as commanding officer of Operational Health Support Unit (OHSU), Naval Medical Center Portsmouth during a change of command ceremony in the chapel at Naval Medical Center Portsmouth, March 3, 2021. OHSU Portsmouth is one of the largest Navy Reserve medical commands with over 800 members in 15 detachments across Navy Region Mid-Atlantic Reserve Component Command and Navy Medicine East. (U.S. Navy photo by Mass Communication Specialist Seaman Christine Montgomery)