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F-35B BF-4

Nov. 18, 2010, the F-35 Lightning II program notched its 500th flight when BF-4, an F-35B short takeoff/vertical landing variant, took off from Naval Air Station Patuxent River, Md., on a three-hour test mission to evaluate avionics software. For calendar year 2010, the program has logged 366 flights to date.

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Taken on July 17, 2010