Marines with the Marine Security Guard Detachment at U.S. Consulate General Ho Chi Minh City, Vietnam took a day to explore the Cu Chi Tunnels, 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. The tour included a display of the weapons and technology used by the Vietnamese military during that time period. (U.S. Marine Corps courtesy photo)