TCNs, or third country nationals. People from neither the US or locals.
From my understanding the reason why is the almighty dollar. They don’t get paid nearly as much as our troops and contractors, but still a lot more than they would make at home. There is quite a bit of info about it if you do a quick search.
Unless you REALLY need color, just buy a Brother BW laser printer. Toner doesn’t dry up. It is all but guaranteed to be the cheapest option. I bought the scanner BW laser printer combo like 8 years ago for $130.