Fourth Medical Battalion

U.S. Marine Corps Sgt. Maj. Carlos A. Ruiz, the 20th Sergeant Major of the Marine Corps, visits Marines and Sailors assigned to 4th Medical Battalion, 4th Marine Logistics Group at the Naval and Marine Corps Reserve Center, San Diego, California, March 7, 2026. Ruiz visited the reserve Marines and Sailors during their drill weekend in order to gain a better understanding of their training. Ruiz also participated as the senior enlisted leader for promotion and award ceremonies. (U.S. Marine Corps photo by Gunnery Sgt. Jordan E. Gilbert)

U.S. Marine Corps Sgt. Maj. Carlos A. Ruiz, the 20th Sergeant Major of the Marine Corps, visits Marines and Sailors assigned to 4th Medical Battalion, 4th Marine Logistics Group at the Naval and Marine Corps Reserve Center, San Diego, California, March 7, 2026. Ruiz visited the reserve Marines and Sailors during their drill weekend in order to gain a better understanding of their training. Ruiz also participated as the senior enlisted leader for promotion and award ceremonies. (U.S. Marine Corps photo by Gunnery Sgt. Jordan E. Gilbert)

U.S. Navy Rear Adm. Pamela Miller, medical officer of the Marine Corps, poses for a group photo with members of 4th Medical Battalion during a visit to Marine Corps Base Hawaii, June 14, 2023. Miller visited MCBH to conduct battlefield circulation with senior military leaders and to ensure the welfare of Marines, Sailors, and their families. (U.S. Marine Corps photo by Lance Cpl. Clayton Baker)