It's not going to hover, that would be insane (in fuel use if nothing else) but the USMC wants/needs a close air support platform. A jet that will fly sufficien

It's not going to hover, that would be insane (in fuel use if nothing else) but the USMC wants/needs a close air support platform. A jet that will fly sufficiently low and slow to attack ground targets effectively. Even when the friendly troops are only a few hundred meters away. That's intrinsically different from the Air Force and Navy whose planes will spend their time closer to 30k feet then 3k feet. Flight at low altitudes and speed requires fundamentally different characteristics then flight at high altitude and comparatively high speed.