Hahaha they use sounds from starshiptroopers!
I find this really amusing! I am currently on the millitarybase map and you hear raspy over radio coms, bit of background sound. Then I hear the black guy, Watkins I think his name is, I hear on the radio "...And I want 2 guards in the tower, up be there, up be there!" Hilarious that they would snatch that ^^
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