Section of the Carrier Platoon, HQ Company, Seaforth Highlanders of Canada with names attached, May 18, 1940. The soldiers have Universal Carriers, Boys Anti-tank Rifles, Bren Guns and Lee-Enfield No. 1 Mk. III* rifles. They are wearing respirators (gas masks) on their chest. The Rifle, Anti-Tank, .55in, Boys commonly known as the "Boys Anti-tank Rifle" (or incorrectly "Boyes"), was a British anti-tank rifle in use during World War II. It was often nicknamed the "elephant gun" by its users due to its size and large bore. There were three main versions of the Boys, an early model (Mark I) which had a circular muzzle brake and T-shaped monopod, built primarily at BSA in England, a later model (Mk I*) built primarily at Jonathan Inglis in Toronto Canada, that had a square muzzle brake and a V shaped bipod, and a third model made for airborne forces with a 30-inch (762 mm) barrel and no muzzle brake. There were also different cartridges, with a later version offering better penetration. Although adequate against light tanks in the early part of the war, the Boys was ineffective against heavier armour and was phased out in favour of the PIAT mid-war. The Universal Carrier, also known as the Bren Gun Carrier from the light machine gun armament, is a common name describing a family of light armoured tracked vehicles built by Vickers-Armstrong and other companies. The first carriers - the Bren Carrier and the Scout Carrier with specific roles - entered service before the war, but a single improved design that could replace these, the Universal, was introduced in 1940. The vehicle was used widely by British Commonwealth forces during the Second World War. Universal Carriers were usually used for transporting personnel and equipment, mostly support weapons, or as machine gun platforms. With some 113,000 built by 1960 in the United Kingdom and abroad, it is the most produced armoured fighting vehicle in history. Canadian variants Carrier, 2-pdr Equipped: Canadian modification to mount 2-pdr gun. 213 used for training. Wasp Mk IIC: Canadian version of the Wasp flamethrower variant. Windsor Carrier: Canadian development with a longer chassis extended 76cm and an additional wheel in the aft bogie.