The idea was, plop a missile launcher up there and you could get some truly ludicrous range out of it and even fire from cover. Basic idea was sound, but it came with so many problems (speed, mechanical failure, the launcher being an obvious target) that they eventually gave up on it entirely.
Cant wait for the Hippo tank concept. Does it eat other tanks? Can it dive in rivers? Is it fck dangerous once it drives your direction trying to slam you down? Is it German, French or from US (big is better?)