F-35B

The F-35B for the U.S. Marine Corps and the U.K. Royal Air Force and Royal Navy employs a short-takeoff/vertical-landing (STOVL) capability. This takeoff and landing operation succeeds through a very innovative technology known as the shaft-driven lift fan propulsion system.
Besides the propulsion system, the STOVL variant differs only slightly from the U.S. Air Force variant.
It carries a refueling probe fitted into the right side of the forward fuselage, rather than the U.S. Air Force standard refueling receptacle normally located on the top surface of the aircraft.
The STOVL variant carries no internal gun, though a missionized external gun is an option.
It shares all the electronic gear of the U.S. Air Force variant, and virtually an identical cockpit layout except for a lever to switch between wingborne and jetborne modes.
Performance and stealth characteristics are also very similar.
The STOVL variant, designed to replace the AV-8B Harrier, has more than twice the range on internal fuel, operates at supersonic conditions, and houses internal weapons.

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