the light tank program. Accordingly, the War Office gave the Tetrarch the official General Staff specification number A17, and, in November 1938, accepted it for limited production after requesting a few minor changes which included the fitting of an external fuel tank to increase the tank's range. Production The number to be produced was subject to fluctuation as the War Office vacillated in their demand; in July 1938, it requested that 70 of the tanks be produced, then increased the request to 120 after a three-day conference in November. Production was to begin in July 1940, but meanwhile the War Office temporarily returned to its original order of 70 before increasing the number to 100. The number further increased to 220 after Metropolitan Cammell Carriage & Wagon, a company part owned by Vickers-Armstrong that would be producing the tanks, indicated it had already ordered armour plating for that many tanks. Production of the tank was delayed by a number of factors. The War Office put their order on hold in a post-Battle of France decision to focus military production on infantry and cruiser tanks, due to the poor performance of British light tanks during that battle. Due to the shortage of more suitable tanks, light tanks that were not designed for use against German armour, were nevertheless deployed against them; the resulting high casualties led the War Office to re-evaluate the suitability of the light tank design. The pre-war role of the light tank, that of reconnaissance, meanwhile had been found to be better suited to scout cars that used smaller crews and had better road abilities. Further delays were caused by the bombing raids of the Luftwaffe during May 1941 against the factories where the tanks were assembled. The cumulative effect of these delays resulted in the production of only a small number of Mk VIIs; estimates place the final total produced to be between 100 and 177. The name 'Tetrarch' was given to the Mk VII, on 22 September 1941, on the orders of the War Office. The last of the tanks were built in the first quarter of 1942 and delivered at the end of the year. Transfer to airborne role The War Office and the Army were concluding, at this point, that light tanks were a liability and too vulnerable for use in further combat, and the Tetrarch was considered to be obsolete. This decision may