Entering the war without a tank industry, 16 Vickers Mk VI, 12 Carden-Loyd carriers, little hope of future help from England, and 219 WW1 era junked U.S. tanks, Canada started her own tank production. The British Tank Mission, in collaboration with the Canadian General Staff, designed a modified U.S. M3 which would become the Ram. The Ram used standard M3 mechanical components, with a Canadian designed hull and cast turret. The first 50 would mount the 40mm 2 pounder cannon and were designated Mark 1. The remainder were called Mark 2 and had the 57mm 6 pounder cannon. Several AA conversions were proposed for RAM tanks. Many of these conversions were found wanting. The famous AA adaption called Skink, often thought to be a RAM conversion was actually a Grizzley.