I've been operating out there on and off since'05 and not seen any FW contractors operating inside the military bases other than US. Bases require a secret clearance.. only US Citizens are likely to qualify except for very special circumstances..I was lucky in having dual citizenship.. Plenty of non-military ops based out of Kabul on the civilian side though almost entirely ZS (South African) and N reg... I've worked for a SA company after obtaining a ZS endorsement in J'Burg.. sit a law exam.. fly a simple qualification flight.. You might need a good contact though.. plenty of South African pilots looking for work out there due to their unfortunate situation at home..