[Rainbow Six]

Out of interest how many facilities are we talking about here? I know there were multiple bases in Spain (Rota, Torrejon, Moron), multiple bases in Italy (Naples, Sigonella, Aviano), Souda Bay in Crete and Hellenikon on mainland Greece - were there others? (I know some of these may have closed irl during the early 90's). Presumably there would have been a US presence in Belgium as part of NATO headquarters but then the whole of SHAPE would have to be relocated when Belgium declared neutrality and i don't see anyone interfering with that (Germany would seem the logical choice for that relocation). Were any POMCUS sites in Belgium? That might be a trickier one as you have no major US units on site to move the gear so the Belgians might have been tempted to try and "appropriate" said gear but as I said in an earlier post you are at a very early stage of the war at this point so the Belgians would have to tread carefully not knowing how the US government would respond to such a move.

For the others, Spain remains neutral throughout, as do Portugal and France and iirc it's some six or seven months before Italy and Greece join the war on the pact side so I still think there is more than enough time for all of those facilities to be evacuated in an orderly and peaceful manner. I don't see "internment" of personnel at those bases happening in any way. Civilians in Italy and Greece after hostilities are declared, yeah, maybe, also any military aircraft or warships that are forced to land / dock in French / Spanish territory but I also don't see any reason why either France or Spain are likely to start rounding up American civilians and putting them in camps even after the nukes are flying. If you want to look at instances where internment is more likely I think you have to consider us - and other NATO nations - civilians who happen to be in Warsaw Pact countries at the start of the war.