DAYTON, OH -- The Air Force, in a joint program with the Army and Navy, is partnering with Lockheed Martin to develop the AIM-260 Joint Advanced Tactical Missile for fighter jets to keep pace with the Chinese PL-15 air-to-air missile, according to the chief of the Air Force’s weapons portfolio. JATM will have a "significantly longer range" yet be similar in dimensions to the AIM-120 Advanced Medium-Range Air-To-Air Missile, Brig. Gen. Anthony Genatempo, the Air Force's weapons program executive officer,...