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Choose the right passengers and switch them out regularly

In certain levels, it is possible - when driving the warthog - to get a marine sniper sitting shotgun. This can help a lot. However, after finishing a wave of covies your gunner and passenger are going to be wounded right? Well you can get out and press 'x' next to their respective positions to get them out, then you can drive around and pick up some brand spankin' new friendlies.
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