What's the meaning of "AO" here? And so we looked at Sterling, distraught, and he said, “Fuck,” and I knew that when he told us his age it would not be much more than ours. “All right, look,” he said. “You guys are my guys.” “Roger, Sarge,” we said. “Our AO just came down from higher. It’s gonna be a goat fuck. You guys have to promise to do what I say.” “OK. Sure thing, Sarge.” What's the meaning of "AO" here? Thanks!