The experiences taken from the development of the A9, A10 cruiser tanks and the A11 infantry tank prompted Vickers-Armstrong to begin development of a new tank. As a private venture, the design did not receive any designations from the British General Staff during its creation. The designing of the tank focused on the tank having the weight of a cruiser, but with the armour comparable to the infantry tanks. The basis was to have the vehicle with 60 mm of frontal armour and a 2-pounder gun in a two-man turret. To make it as light as possible, it was small and featured a cramped interior. The design used features taken from the A9 and A10 tanks so the design was easier to produce and cheaper to make. Vickers unveiled the design to War Office at February 10, 1938. While they initially viewed it unfavourably for its tiny two-man turret, they took it in April 1939 due to the growing tense situation in Europe with Nazi Germany, with the first order coming in May 1940 after the losses suffered by the British Expeditionary Forces in the Battle of France. The name Valentine was given to the tank sometime between its introduction to War Office and its adoption. The origin of the name is disputed, some say it was due to its introduction on February 14 in 1938 or 1940, other say it was the middle name of Sir John V. Carden, who helped design the Valentine's predecessors. Other sources say it is a name from the Vickers' company full name (Vickers-Armstrong Ltd Elswick Newcastle-upon Tyne), and David Fletcher from Bovington Tank Museum say that "Valentine" was a code name used by the company for its development. The Valentine was put into service as quickly as possible under the designation Tank, Infantry, Mk.III. Vickers, Metropolitan-Cammell Carriage & Wagon, and Birmingham Railway Carriage & Wagon Company were all involved in the construction of this vehicle. During World War II, Canada was also contracted to build the Valentine to build up their own tank forces. The United Kingdom produced a total of 6,855 Valentines during the war between the three company while Canada built 1,420 Valentine tanks in their factories, for a total of 8,275 tanks produced, making the Valentine the most produced British tank in the entire war. -WT Wiki