Blast from the past....M1 Abrams Air-Ground Defense System

Thanks to BlackTail for reminding me of this...

This puppy would have been so glorious!  Twin, hard hitting 35mm cannons (of course we would upgrade this to either a 57mm or 76mm setup today) with 12 ready to fire missiles?

M1 mobility so it could keep up with the Ground Combat Element?

Already in service so we could simply use hulls in storage?

This was a no brainer that the Army should consider!