File photo of Lockheed Martin's F35 Joint Strike Fighter F-35B test aircraft BF-2 flying with external weapons

 
File photo of Lockheed Martin
The U.S. Marine Corps version of Lockheed Martin's F35 Joint Strike Fighter, F-35B test aircraft BF-2 flies with external weapons for the first time over the Atlantic test range at Patuxent River Naval Air Systems Command in Maryland in a February 22, 2012 file photo. REUTERS/Lockheed Martin/Handout