Hey all. I just bought Halo 3 and 3 months of gold access. I have been playing social and a little bit of Basic Training. I have tried numerous times to play the ranked team slayer, but it will not let me. The start matchmaking is greyed out and it says one more more players do not have the maps requier to play. What am I suppose to do? Do I have to gain a certain rank or are there certain maps I need to DL from marketplace?