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Posted by: Screenlag
I think the problem would be that you'd only face one enemy, humans with assault rifles, and maybe sometime you'd meet a slightly stronger marine with a battlerifle.
Not enough different kinds of enemies on the UNSC side
Edit: I believe you only had a change to actually shoot marines in Halo 2, and you'd need a sniper for that and they wouldn't shoot back.
In the level, sacred icon, you have a chance to save a group of marines under attack by flood.
After saving them from across the pit, with the sputnik skull, you could grenade jump over to the marines, bypassing the trigger that causes any living marines to die.
Any surviving marines you save are hostile, and will attempt to kill you when you jump over to them. You can either ignore them, kill them, or walk over to the trigger, and watch the marines literally drop dead.