Captain Miller's Macropterous Mechanized Marine Corps.
A group of highly trained, well endowed women who ride around in giant, steam-powered, large-winged robots. (Macropterous=having large wings. The robots can fly, but the wings are collapsible) Their weapons: built in chainguns, chainsaw-swords, cannon-sized revolvers (around 90 mm, HE rounds). The robots can be equipped differently, ie, with bombs, missiles, extra guns or auxiliary fuel tanks. Notably, the team sniper uses a 135 mm rifle/cannon.
They launch out of the airborne battleship the Virgil, which itself is heavily armed. (it's called the Virgil because it is supposedly capable of braving the depths of The Inferno, read some Dante, dammit). And they are led by the legendary Captain Miller, a 5'4" blonde woman who, if Vin Diesel, Chuck Norris and 2 or 3 T-1000s from Terminator 2 were to fight her at once, she might just start to break a sweat.
I have too much time on my hands.