> You're making the bold assumption that the robots will actually work, instead of wasting ammunition on all the wrong targets, including friendlies

I could easily imagine the US military deploying autonomous combat bots to some middle-eastern country unaccompanied by human troops. They would care approximately zero about wasted ammo, and we already know from our drone strike policy what the military thinks about accidentally killing non-combatants. As long as there are no Americans around to get killed by rogue bots, it doesn't really matter how much collateral damage they cause, within reason.