Returning Map: Vacant
Vacant is a small map, on par with Rust or Scrapyard, but with a much more enclosed feel to it. Only the area near one point is open enough to allow killstreaks to do much work, and the other two points are virtually impenetrable by anything from the air. This makes the AC-130, Chopper Gunner, and even the Predator Missile virtually useless. On the other hand, sentry guns will do a LOT of work on this map, if you put them in the right places. Other than that, your shotguns, SMGs, and claymores will do most of the killing for you.
The A point in Domination is stuck outside, just like you would expect. This is the point that killstreaks can affect, though unless your team has both B and C, you're not going to be able to spawn lock them with just air support. You'll have to guard one of the six different entrances; the left side warehouse and it's side door, the two windows and their middle door, and the far side door. Six entrances, in a domination game using six people on a side, mean that almost always one person is going to get in.
The B point is in the middle of the little courtyard, and has absolutely no cover from it's entrances, or the sky. It's one place where a predator is going to land and cause some hurt. The only sure way to capture this point is to have so many bodies thrown on it that it's impossible to tell who is alive and who is dead, and only then hope that you're not going to explode when someone tosses grenade into the little enclosed room.
Meanwhile the C domination point is in the far back computer room. Neither domination nor ground war domination are small enough game types to have the gated doorway open, so you're going to have to deal with two entrances to the area. One is on the warehouse side, which is easy to defend against anything short of explosives. The other is more likely to be forced open by sheer weight of people, so you'll want to focus your defenses there. The gate will allow attackers a glimpse inside, but they can't access or cap the point from there, so it's only worth using to get an idea of where the defenders are inside the computer room itself.
Vacant is one of the two maps returning from Call of Duty 4 in this game, so veteran players will know all the ins and outs. Just remember to rock out your AA-12 shotgun and you'll probably be fine. No matter what, though, go outside to call in your care packages. You won't hit the skylights right.