I would like at least 3 fire teams. There is a reasons most real world military organizations squads are composed of 3 fireteams. 2 fire teams to lead the assault and 1 fireteam behind to help which ever team hits resistance first. If they had much more then 12, then most mission the extra soldiers would be on dropship watch... Too many would take away from the challenge and be annoying to have to move them all.