One of the most distinctive military vehicles to see British military service, the Alvis Stalwart was a capable amphibious 6x6 cargo truck, introduced to keep Army units supplied with fuel, ammunition and general supplies during conflict. 

Initially developed as a private venture, the Stalwart can trace its lineage back through a series of successful 6x6 vehicles, most of which saw British military service, such as the Saladin armoured car and Saracen armoured personnel carrier. The Stalwart shared many components with its predecessors but was charged with performing a very different role.

Entering service from 1966 onwards, the Stalwart lived up to its name, with its impressive off-road performance giving it a go-anywhere, fear-nothing reputation. Featuring an intricate drive and suspension system, the Stalwart afforded its crew a comfortable ride when operating over uneven terrain. 

However, even though the vehicle could reach speeds approaching 40mph on open roads, handling the Stalwart could be challenging, with each bank of wheels constantly trying to outpace those on the opposite side.

A true amphibian, the Stalwart boasted watertight seals to protect all vital components, enabling it to deliver its vital cargo across bodies of water not served by bridges or temporary crossings, climbing out of the water on the other side if the ground was shallow or compact enough to support its weight. 

In the water, the Stalwart Mk.2 featured improved waterjet power and could reach speeds of 16km/h in optimum conditions.