Over an Atlantic test range near Naval Air Station Patuxent River, U.S. Marine Corps test pilot Lt. Col. Fred “Tinman” Schenk completes the first flight of F-35B test aircraft BF-4 in short takeoff, vertical landing (STOVL) mode. The flight marks growing maturity of STOVL flight with the third F-35B aircraft at NAS Patuxent River performing STOVL test missions. BF-4 is also the only mission systems test aircraft flying Block 1.0 software to fly in STOVL mode. The F-35B STOVL variant and F-35C carrier variant are undergoing test and evaluation at NAS Patuxent River prior to delivery to the fleet. Photos courtesy of Lockheed Martin.

NAVAIR press release