I'd say my greatest moments would be on Halo 2 since Coagulation had epic battles on that map I've had games with great back and forth, also the game zombies, and can't forget the custom game mods. One of the greatest games I had was when I joined my friend in a group of 14 people and we all played Swat on Turf which was awesome. It started out as finding each other and killing enemies and ended with one team of hog spawn and other behind the doors in front. I remember being behind the doors and waiting for the rest of the team then him hitting the door yelling "CHARGE!" And ending up with one person at hog spawn and waiting for another attack. That was awesome there was plenty more but that I remember the most.