I checked and couldn't find it anywhere else. I am sorry if it's a dumb question. How do you change the symbol of your flag? I've seen screenshots of different symbols on flags in Halo 2. Is it a mod or something?
Depends on the game type. If you play for example a big team battle then it uses a default flag. If you play a land grab game then the flag will show the emblem of the player who obtained the territory.