The LARC-V was fielded in 1963 and were used extensively by the U.S. Army for over the beach supply during the Vietnam War. They supported the logistical and manpower build up at the start of and during the Vietnam war. Two units arrived from Ft. Story, VA. in June 1965. The 344th Transportation Company (Light Amphibious) setup harbor operations in
Qui Nhon and the 347th Transportation Company in
Cam Ranh Bay. The companies had two platoons of 17 LARCVs each and a separate 3rd echelon maintenance detachment. About December 1965, one of the 344th's platoons moved to
Da Nang and was attached to the Air Force wing. There it ran 24-hour/day operations hauling bombs from ships in the harbor to the flight line. Their operation was so crucial to the USAF that if at least 15 LARCS were not operational, any needed parts were flown in by Nonoperational Ready Supply Grounded (NORSG) aircraft from St Louis. 458th Transportation, LARC-V Company, arrived in Cam Ranh Bay Oct 1967.
101st Airborne Division in 1967 and later the
1st Cavalry Division in 1968. LARC-Vs were used by the
Argentine Marines during the
1982 invasion of the Falkland Islands. In January 2011, during the
2010–11 Queensland floods in
Australia, it was reported that
C-17 aircraft of the
Royal Australian Air Force were to carry two LARC-V vehicles for use in Operation Flood Assist. The vehicles were deployed from
Townsville to
RAAF Base Amberley. ==U.S. Navy service life extension program==