Halo 2/Midship/Rotary Tactic
This tactic is made for team slayer, and it worked quite well for me in the past. Split your team into two smaller groups that run around the outer ring of the map opposite from each other but in the same direction. It often gives the enemy very little chance to recover when respawning, but makes it easier for lost players of your team to join back in the fray. Often works well with one short range player (shotgun or sword) and one long range player (BR or carbine, plus PP) per team. It is possible that this could also work on a map like Warlock, if you keep to the upper levels, or on Foundation, with maybe three or four groups. However, it has not been tried out on these two maps to any knowledge of mine.