User blog comment:Crazy sam10/Advanced Warfare Create-a-class, item slots, and Atlas Gorge DLC announced./@comment-402843-20150212011037/@comment-24756040-20150216033415

They don't do it in Black Ops 1 or 2 (unless you join a DLC owner's game when you don't). If you have the DLC yourself its automatically in the rotation. In W@W all the DLC was in the rotation, and when Free Fall was free, it was in the rotation.

Now that I've been playing a bit more now, I haven't been in a game with the DLC since a few days ago, so I may have been subject to an exception.