The Lightning II evolved from the X-35, the winning design in the [[United States Air Force|USAF]] Joint Strike Fighter (JSF) design competition. The [[Lockheed Martin]] design defeated the [[Boeing]] designed X-32. | The Lightning II evolved from the X-35, the winning design in the [[United States Air Force|USAF]] Joint Strike Fighter (JSF) design competition. The [[Lockheed Martin]] design defeated the [[Boeing]] designed X-32. |