If the US Military or DOS paid them and ordered them to be there, whether .mil, civilian, or as a contractor for the US government, NATO, or the now defunct Afghan government and are US Citizens, they (US DOS) are responsible to get them out for free. Now if an idiot went over there on their free will outside of a contractor or official orders then they should be charged for it.
Like the Brit guy who was there for sh1ts and giggles trying to monetize it on his channel. The Brits rescued his @ss. 😡