neb: They sell an export version with the (appropriately-named and mis-spelled) Export Armor Package to all sorts of questionable places, so there's no problem there.
Yes, they do, but they would have to manufacture them. If they were to draw down their own stocks, then even the obsolete ones at the boneyards have at least the DU armour, if not DU + ceramics which would need to be retrofitted. Either way, they don't have a bunch lying around to be shipped overnight via Amazon Prime. :-) This article explains it in some detail.