Air:

My vote goes for the F9 Sparrowhawk/Dirigible team -- whacky idea that almost worked.


Sea:

My vote goes to the Surcouf, a french sub that mounted 2 203mm guns in a massive turret.


Land:

Many contenders, but I do have to go for the incendiary pig. The whole Idea of using a pig in such a fashion is simply starkers.

BTW, have any of you ever sent a full stack of those into custom battle, I've always wanted to try it but......