Actually just read the guys quote on manikins I think hes onto something there, yeah you're right hoods have been done to death already. Hmmm seeming as a basic non removable weapon, you would have to go with a minimumn of moving parts, and obviously for close combat, as in last resort essential, like a soldier and his bayonet. Probably a secreted blade, ram blades punching out of the knuckles ala wolverine have been done to death also, the sheer eviscerating effect of just over a foot of steel rolling out of a forearm on the wrist axis would make for a fearsome delivery,of course youre probably making the entire arm interchangable you could go torso mounted weapons with a fluid deliver system, ie acid, flamer etc, or the imolating energised skin, that basically electrocutes/overloads anyone/thing coming into contact with the machine. Or even a decoy like a humanoid wire droid that explodes out of the chest cavity, and wraps itself in an hologram of the droid itself, to create confusion and mayhem, allowing the droid to retreat and regroup. Mouth bourne poisoned fletchete rounds, hmm list is endless, describe what kind of effect your going for, Darpa lol, nah im just a war nerd in the army.