MOUT McKenna is a complicated map with multiple levels and poor lighting conditions. It is also very small, resulting in a large number of surprise and CQB conditions. To work effectively, you MUST travel as at least a two man element, three or even four being best, but no more. Cover all directions, and especially watch upper windows. Try to seize objectives and defend them, instead of prowling around looking for a fight. Alpha and Charlie both are good spots to defend with at least two people. Bravo is a bad choice, and NEVER hide in the tower, the number of people able to place a grenade right in it is astounding.
Don't bother with tunnels in the beginning unless you're sure you can either handle opposition or get through them without enemy contact. One person can move through either tunnel, allowing one to flank any blocking forces.
Loyalty's best tactic is to either defend Alpha or rush into the Honor staging area from tunnels or through Gray building. Both have their advantages and disadvantages.
Honor should attempt to hold Charlie. Token resistance should be put up for Bravo, as it is almost even odds there (Watch for Loyalty members who rush into the objective). Hiding behind the ladder in the church is effective in this case.
Good luck on MOUT, keep your ears and eyes open and be ready to run or shoot at any time. Learn to use NVGs well, too.
-Captain Requiem, Second Wolf Battalion - Alpha Company http://www.squick.org/~diesel
You really got to use nades a lot and listen for the enemy's' footsteps. The SAW will also help you greatly.
added on behalf of http://www.taah.com/