The difference between the military and the neighborhood computers you used to assist with are the military has to deal with a plethora of entry points for viruses, and can't scrub every USB thumb drive that is at home rather than at the office. I get the feeling that you've not been doing this for 10-12 years yet. Am I right?
The hospital my dad works at, and all other hospitals in this area of the UK, all the machines have the USB ports disabled. All laptops issued by the local Health Authority have the USB ports/bus disabled. They had issues with worms, twice back in the early 00s, and after that all removable storage was banned.
If it's good enough for the NHS, it's good enough for uncle sam.
It seems pretty trivial to me just to string the cabling into a lockbox with the computer inside to prevent people from screwing around with your ports.
That said, i'm not in charge of physical security of anything. I'm sure the guys with missile launching computers figure anybody that can get to the secure terminal is trustworthy.
