I think it would be cool if there was a huge campaign, and fireteams were randomly assigned an objective to complete that would affect the whole outcome. E.G: a fireteam has to destroy a major supply depot, which if completed, would affect the number of enemies that another (or your own) fireteam would fight against in a later objective. You could make a set fireteam (so it's always the same 3 people), and it would be assigned to a platoon/battalion etc, that would be sent to a planet. Or not fireteams, but clans. That would at least make clans useful in the game. Once that planet is completed, you could be moved to another. Making it so actions by individual fireteams would affect the way the battles/wars for each area are decided would be pretty cool. Make it like a real war. That way those who are REALLY good, can actually become legends. Some 12 year old in Seattle would be like Audie Murphy or something. Doing all that would need so much organising and control it would be impossible to do, I understand. But, It would be cool.