The Stalwart, formally classified by the British Army as Truck, High Mobility Load Carrier (HMLC), 5 Ton, 6 x 6, Alvis/Stalwart and informally known by servicemen as the Stolly, and by former RCT as the Stally, is a highly mobile amphibious military truck. Built by Alvis Cars between 1963 and 1971, these vehicles served with the British Army from 1964 until 1993.