For the first rush, the two Lt's will go about using the usual artillery and airstrikes at the gate. They will not go into the gate just stay outside and continue airstrikes until death. The Med's and Engineer will set up inside the Allied garage. The Sniper will setup where he wishes and cover top.
After the first round of deaths or when the flag is considered secured. One Lt will assist the rest of the team inside the Garage. Watching the one door alone until the Warehouse door is blown. Once that is done they will set up to defend the stairs and have one player keep an eye on the door. But will absolutely not leave the garage to engage, ambush only. The other LT will sit on the sniper row out of sniper range and watch for any Axis coming up the spawn ladder. The sniper will continue sniping and reporting anything he sees.
We used this and it seemed to work pretty well. There should be a stage that allows people to be up top at the comm tower when one side goes down. Right now I cannot think of one and if worked well this setup would take down any Axis on the way to the Comm Tower. All entrances are covered and done so without a lot of space inbetween players and also putting Axis in a position to be killed easily.