Lockheed Martin X-35
The Lockheed Martin X-35 is a concept demonstrator aircraft (CDA) developed by Lockheed Martin for the Joint Strike Fighter program. The X-35 was declared the winner over the competing Boeing X-32 and a developed, armed version went on to enter production in the early 21st century as the F-35 Lightning II. == Development == The Joint Strike Fighter (JSF) evolved out of several requirements for a common fighter to replace existing types, including the Common Affordable Lightweight Fighter (CALF) program, one of the JSF's predecessors.