you need to make a sirrea 101 like in the campain to make this you should make a playlist called siera battle and the maxuim game size should be 40.Any way back to the seira when you make it you should make it so in the back there are 4 warthogs and two scorpions.when some one wants to drive the warthog or the scorpion the player should be able to go up to a controll panel and hold x and when he does this the siera lands and you can drive away also you should have 10 turrents, 5 rockets 2 regular and 3 gernade turents.The captain should be able to drive it and when the player preses and holds lt a mac beam fires and on the other have a gernade launcher.there should also be a player behind the captain that has controll of a rocket turent,and a missle launcher.