WWII M2 light tank. Not so hot against the Afrika Korps in 1942, pretty decent on Guadalcanal. The 37mm shells bounced off of German armor, made a mess of Japanese machine gun nests. It'll take a lot of beer.
I've got a running enginge out of a AMC Pacer and a pile of scrap metal I'd donate to that project. Somebody must have one of those old Ithaca Mag-10 sitting around collecting dust somewhere........
