An international team led by Lockheed Martin, Bethesda, Md., won the competition to build the Joint Strike Fighter (JSF), a stealthy, supersonic, multirole fighter designed for the U.S. Air Force, Navy and Marine Corps, as well as the U.K. Royal Air Force and Royal Navy. The wins signals a go-ahead for the team of Lockheed Martin, Northrop Grumman and BAE Systems to produce an initial 22 aircraft in the program's $25 billion System Development and Demonstration (SDD), formerly known as Engineering and Manufacturing Development (EMD) phase. The total program is valued at approximately $200 billion and will be a cornerstone of future defense capability for the U.S. and its allied partners. The Joint Strike Fighter is designed to replace the A-10, the AV-8 Harrier, F-16 and F/A-18.