I didn't have a prep-guide for the ASVAB. I just did really well on it. I took it once as a Junior, but then had to retake it again a year+ later before they'd let me enlist.
I think I'm where I'm at more in spite of my military service rather than because of it. Almost none of the "job skills" I learned ever panned out for a civilian career. Only the attitude has stood me in good stead. A certain perspective that there is very little out here that can REALLY stress me out.
And thus, a great diplomat was lost ;-).
After the State Department interview (a full day), I was never nervous about any other job interview!
I have to confess I'm gloating a little at the though of Anoreth in the military ... after all these years of dragging her out of bed by her ears.