Looking for a game from past years ago

hello everyone i am currently in need of help i am looking looking for the game i was playing back in my childhood days the game as if i remember is a shooting game at first you guys get invaded in the ship by soldiers while you have to stop them and after you have to repair something on the left side of the spaceship the game i think has 4 classes the sniper, the assault, the repair, and the fat minigun guy with hazmat so please if you remember the name of this game kindly tell me. thanks

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