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Yusef is a Tunisian man who helps Popski's Private Army in Matmata in Call of Duty: Finest Hour. He uses a Springfield equipped with a sniper scope as his weapon of choice, and always wears civilian clothes.
It is possible for Yusef to die in the second mission he appears in, but if he survives, he will be seen mounting the last MG42 after the last objective is complete, staying there and presumably giving the other soldiers cover.