[pjc50]

It's for throwing the alien queen off the spaceship, obviously.

(It looks uncannily like the loader Ripley drives in Aliens)

[philipwhiuk]

Or destroying AI controlled attackers swarming from the ceiling

(It's also close to the APUs in Matrix Revolutions).

[ASalazarMX]

Also looks like a rudimentary Fallout power armor.