LOS ANGELES (AP) — The makers of “United States of Al” are keenly aware they’re treading on sensitive ground with the new CBS series about two survivors of war. Riley is a combat veteran back from the Mideast, camped in his dad’s garage and facing PTSD and a tattered marriage. He can savor a recent win: helping bring his Afghanistan translator and friend to live with him in America. That’s the basis for the latest sitcom from veteran producer Chuck Lorre, who said his main goal for any show is making audiences laugh and care about the characters. But he said there is also a political element involving the military interpreters.