Lt. Col. Justin Moeykins, Region 3 Commanding Officer for Marine Corps Embassy Security Group, stands inside one of the Cu Chi Tunnels during a trip to visit the Marines with Marine Security Guard Detachment Ho Chi Minh City, Vietnam, May 4, 2022. The tunnels were used by the Viet Cong as underground routes to transport communications and supplies, lay booby traps, and mount surprise attacks. (U.S. Marine Corps courtesy photo)