The Panzer Panther, the Konistiger(King Tiger), and Jagdpanther(turretless tank-killer), m26 Sheridan, Churchhill, Cromwell, Stewart, Puma.
I remember Aces of the Pacific had a four-engine Japanese bomber with a cannon on the back of it. It's been so long, I don't remember it's name.
Aimable walking-stuka rockets(couldn't they aim them in the war?? Or at least adjust the angle)
Wishing big here, but Submarines and battleship fleets.
Can't a monkey dream?