Three JSF versions are being developed: the F-35A conventional takeoffandverticallanding model, the F-35B short takeoffandverticallanding variant, and the F-35C carrier-based attack version.
The F-35B is the first aircraft to combine stealth with short takeoff/verticallanding (STOVL) capability and supersonic speed.
F-35B战斗机是第一架结合隐形和短距/垂直起降（STOVL）能力的超音速战斗机。
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Schwartz did not mention progress on the Navy's version of the jet, the F-35C or the Marine Corps' F-35B short takeoffandverticallanding version of the fighter.