In similar vain to the "Biggest mistakes in aviation?" thread, but with more imagination! Take an existing design (plane, spaceplane, ship, helicopter, tanks, etc) and add your own flair to it.
I'll lead the charge -
Bomber: B-60 with 4xT57 P&W contra-rotating turboprops 15,000shp; wing...
Suppose that operational helicopters were delayed several years beyond the original time line.
Airborne operations are still limited to parachutes and assault gliders.
What direction would assault gliders develop?
Would they be limited to delivering small squads (say the men) to capture...