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I was just doodling around one day... I tried this several times so I'm pretty sure it will work for you guys. What it does is you can kill your own team w/o having to go back to the checkpoint, and you can complete the mission, yet you wont have to go to the next one. The mission will never end. This is how you do it...
Go to Mission Select, and Act I, Charlie Don't Surf (That is the only mission I know that it works on) and any difficulty. Put in any cheats you would want, but later you wont be able to turn them off or turn more on. Go far enough into the mission that you get a Checkpoint. Then, Save and Quit. Go to Arcade Mode, and choose the same map, and the same difficulty. In Charlie Don't Surf, there is a guy to the left of you on the helicopter. Shoot his leg. It should say "Friendly Fire will not be tolerated!". But then what happens? You spawn at your last games checkpoint. From here, cheats are enabled. Point do not save (sadly) but you can now kill your own team and stay in the mission for as long as you want. Finish the whole mission, and your 3 invulnerable guys will just stand there doing nothing. I dont know if you can do achievements or not in there. But anyways, thats the glitch. Dont know if you guys already knew this or not but i posted anyways lol. Have fun!