The D model isn't a trainer. It's the Marine Corps two-seat attack variant. I don't think there are flight controls in the back seat.
yes, but ...
Navy uses the D as a trainer. This was a Navy hop, right?
Indeed the Marines use it as a strike and FAC platform.
I betcha the WSO has a joystick.
For reference: http://www.hqmc.usmc.mil/factfile.nsf/0/7e09ddd6d3f77a398525626e004927b2?OpenDocument