Here's what I know about base taking (HiTech, please correct me if I am wrong).
In order to take a base, its adjoining town must be 75% down (showing a white flag) and all of the town ack must be down. Also, if the town is close enough to the base in which its auto ack is in range of the troops, those auto acks that are in range must be taken down as well. Once this is all done, 10 troops entering the map room will take the base.
Now a couple things to consider:
**ALL ACK CAN BE RESUPPLIED. A box of supplies takes 15 minutes off of the time it stays down, just like for barracks, fuel, and ordnance. This also includes town ack!
**An auto ack does not actually have to shoot the troop to kill it. If a troop is within range of an auto ack, then it automatically dies. I don't know what that exact range is though, maybe HiTech can tell us.
**If enough buildings pop up while the troops are running to bring the town below 75% then the troops will not take the base.
I have seen a couple instances where the following scenario happened:
1> A town was brought to white flag conditions.
2> 10 troops were released.
3> An enemy LA dove on the troops killing three of them and then augured.
4> 7 troops went into the map room.
5> While bringing more troops in, buildings popped back up and it was no longer a white flag.
6> Those buildings were taken down, bringing it yet again to a white flag
7> 10 more troops were released. When the third troop entered the map room the base was taken.
This tells me that the 'troop count' in the map room doesn't automatically reset when buildings pop back up. I assume that the life of the troops are timed just like everything else and they will continue to play poker in the map room until either their time expires, ack pops (in which they are automatically killed), or until someone strafes or bombs the map room (or walks in and kills them with the handgun). I'd be curious to find out how long that life span is...
I have heard rumors that if friendly troops are dropped on a friendly town, then each friendly troop that enters the map room will cancel out one of the enemy troops that are in there. I have yet to verify this and doubt that it is true, but it might be cool to test...