long tom
a duck
PVT - Private (E-1)
The UK Army are called Pongos, (because historically where they go the pong goes,) well that's what the Royal Air Force call them, they call us Crabs, because we march sideways and they cannot.
Small cannon man
In portable cannon, possibly the Parrot rifled cannon. In cannon mounted in fixed positions, such as forts, possibly the Dahlgren cannons. There was also a very large bore mortar known as the Dictator that fired a 13 inch shell.
You know what? I thought this question was a joke; either that, or that someone had mistyped GI Joe. But I was wrong. Just in case, I did a little digging. I found that during the second world war, GI Moe was slang for an army donkey. [Believe it or not, I made sure to confirm this before I sent it out. There's a possibility that everyone online who notes this is noting it from the same source. But there are more than a few noters, so that's pretty doubtful.] Anyway, hope it helps.
crow
cook
Crow
British Army slang from way back referring to women's breasts.
It's DRAGON. A Gun is a slang term for a weapon such as a pistol, revolver, rifle, cannon, or other gunpowder projectile device.
American Army slang for a common infantryman, originating in WW2
G.I., Grunt
they have to learn how to use a real cannon in the army
PVT - Private (E-1)
it means "i agree" its an expression for pride
" Meg" "Mons Meg" was the name of an ancient cannon
This is called conscription. The American slang word for it is "the draft".