You got that right...not to mention...prohibited. Having flown F-4s for several years, I'd say the "right pilot at the controls" that Nightflyer referenced was really a dumb pilot if he's purposely tail-sliding the beast. FWIW, if you really, really f-up'd a normal spin recovery, you could get the T-37 into an inverted spin. Again...the right = dumb pilot axiom applies.