Manpower

I just want to point out some pitfalls of trying to make the government/our military have a ROI and super efficiency. Actually, it can also apply to anything that becomes extremely optimized with humans in it.

Robo-Cannon's Manpower Problem

So they won't have enough people for 24 hr operations, as someone has to drive, and the other to pay attention. It would be like trying to drive cross country by yourself ... you can't take a nap cuz the car crashes. If one dude is out of the fight, there is no excess capacity.

Bad thing for the military, often people are used in ways that are not designated by their MOS.

When designing stuff, remember the big picture, and add some resilience, just in case. It normally works out that you need it.