Three F-35 Joint Strike Fighters (rear to front) AF-2, AF-3 and AF-4, can be seen flying over Edwards Air Force Base in this December 10, 2011 handout photo provided by Lockheed Martin. ... more 
Three F-35 Joint Strike Fighters (rear to front) AF-2, AF-3 and AF-4, can be seen flying over Edwards Air Force Base in this December 10, 2011 handout photo provided by Lockheed Martin. REUTERS/Lockheed Martin/Darin Russell/Handout less 
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Reuters | Photo By � Handout . / Reuters / Reuters
Wed, May 7, 2014 2:25 PM EDT