All three Lockheed Martin F-35 variants at Edwards Air Force Base, California.
America's most expensive weapons system ever built is on track for "initial combat use" by September 2016.
Business Insider recently toured Lockheed Martin's massive production facility in Fort Worth, Texas, where the three F-35 Lightning II variant aircraft are designed and manufactured.
The $400 billion and counting F-35 program has so far delivered 140 of the anticipated 2,443 jets to the US Department of Defense and five aircraft to foreign military buyers.
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