STOVL F-35 conducts flight testing Published May 15, 2014 By 412th Test Wing Pubic Affairs and F-35 Lightning II Pax River Integrated Test Force Public Affairs EDWARDS AIR FORCE BASE, Calif. -- A Short Takeoff and Vertical Landing (STOVL) variant of the F-35 Lightning II is shown performing Crosswind and Wet Runway testing at Edwards AFB May 6. Pilot Dan Levin and a team from the F-35 Integrated Test Facility at Patuxent River, MD accompanied aircraft BF-4 for the deployment to Edwards April 11. Testing is expected to continue until June 14. The F-35B will be the single strike fighter for the U.S. Marine Corps, replacing both the AV-8B Harrier and F/A-18 Hornet.