Stalwart MK11

The FV 620 Stalwart, informally known by servicemen as the 'Stolly', is a highly mobile amphibious military truck built by Alvis that served with the British Army.

The Stalwart was a private venture by Alvis that was adopted and entered service with the British Army in 1966 as a general transport truck in preference to the FV431, the load carrier variant of the FV430 series. It was one of the same line of vehicles that included the Alvis Saracen, Saladin and Salamander. The high mobility and amphibious capabilities were considered ideal for resupplying units in the field.