If  some day an adversary builds a missile  that is capable of  catching up to one of these airplanes and a Raptor pilot sees that a strike  is  imminent, he hits the 'b.o.b.' and the  airplane makes a virtual U-turn, leaving the missile to pass    right on by.
They know that in the process he'll  temporarily lose consciousness, so the Raptor then automatically    comes  back to straight and level flight until he wakes back up.