Possibly refugees from South Africa. If that country goes pear shaped in a big way during the Twilight War, it's not unreasonable to hypothesize the South African military trying to evacuate white civilians, and military personnel, to the nearest patch of stability with a First World military force on the ground.
Plus you can't hardly have anything military set in Africa without having a Rhodesian ex-pat or two in the frame -- circa 2000 you could still have some veterans of the war there who'd be young enough to still keep up with younger guys.
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