Business Insider: These are the 15 best photos of the F-35 from 2015
Lockheed Martin's F-35 has had a busy 2015.
In November, the plane tested its onboard cannon aerially for the first time. This came months after the plane first successfully fired its cannon in June.
Successes such as these led the Marine Corps to declare, in July, that the F-35B was ready for combat.
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