Spartan119 the Red Raven.
"So officer tell me how it feels to be at the wrong end of that barrel?"
personally the look or halo 3 but instead of foam green armour, have it be more grayish like ODST's have. then it would be the best.
the marines also need amazing AI and should be self sufficent in there decitions not just following a set course thru a level or following the chief all the way. they need movment formations taking cover and attack tactics like flanking and grenading and covering fire and charging all at once, or any combination of these.
but above all they need to be able to work together. they need to BE aware of there surroundings and should act on whats around them not on a linear course.