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The Centerfield STOVL (Short Takeoff/Vertical Landing) was completed in 2009, to support the developmental testing of the Joint Strike Fighter (JSF) F-35B STOVL aircraft. Located in the centerfield area at NAS Patuxent River, the STOVL Centerfield Facility consists of an AM-2 Expeditionary Airfield (EAF), an AM-2 Vertical Takeoff and Landing (VTOL) pad within a painted LHD deck outline, a Ski Jump, and a grated Hover Pit. The EAF and VTOL Pad AM-2 surfaces are representative of current US Marine Corps austere/forward deployed basing capabilities. These surfaces will be used to test F-35B compatibility during Short Takeoff (STO), Vertical Landing (VL), and Slow Landing (SL). The Ski Jump, built to match the profile of the UK HMS Invincible Class Ships, will provide a land-based test site for unique ship compatibility. The Hover Pit was constructed during the X-32/X-35 concept demonstration phase of the JSF Program and has supported operations with British Sea Harrier aircraft. The Hover Pit also provides a means to perform STOVL mode engine runs without ground effects by ducting exhaust thrust away from the aircraft through a series of vanes below the top grating of the pit.