The multinational Lockheed Martin F-35 achieved its first vertical landing today, a major step forward for the struggling stealthy single-engine fighter test program. The vertical landing took place about 1:23 p.m. EDT at Naval Air Station Patuxent River, Md. The aircraft rode more than 41,000 lb. of thrust to achieve the vertical landing; this milestone is key in proving the aircraft will be suitable for the U.S. Marine Corps, and British and Italian forces. The landing occurred after an 80-kt. short takeoff at 1:09 p.m. About 13 minutes into flight, Grant Tomlinson, F-35 lead short-takeoff-and-vertical-landing test (Stovl) pilot for Lockheed,...