What type of person does it take to become a Spec Ops?

I have been looking at many career options but nothing sounds more intresting and right up my ally as Navy SEALs, SARC, Marine Force Recon and USAF PJ. What type of personality do you need to become anyone of these military personal. Not the generic strong willed response either I mean these men are wired in the head different and I want to see if I have the personality.