FRED KAPLAN: Finally, the Army is promoting the right officers. “Last November, when Gen. David Petraeus was named to chair the promotion board that picks the Army’s new one-star generals, the move was seen as, potentially, the first rumble of a seismic shift in the core of the military establishment. The selections were announced in July, and they have more than fulfilled the promise. They mark the beginnings, perhaps, of the cultural change that many Army reformers have been awaiting for years.”