I saw a thread on abandoned cold war projects that would have been handy to have but never got off the ground.
So im going to do a projects in world war 1 or 2 that either were built but never got past the prototype or never got past the drawing board. Or something that was invented after the wars and put them in a alternate situation if they had been invented during or before.
But no more than 10 years after the wars for projects that came along earlier.
This can be anything from tanks, aircraft, ships. even bombs.
Have a bash!