Thanks for the links. That one quote sounds like Hersh doesn't like people asking about his background--might raise questions he'd rather not answer, evidently.
You're welcome!
I think you're right. Additional info on his background:
A Ghost In The Iraqi Prison Front Page Magazine 5-14-04
Abu Ghraib’s Kitty Kelley National Review Online 9-17-04
Seem to remember reading on this forum (somewhere in the 'Kerry files') speculation that Kerry provided information that influenced his writing of 'My Lai Massacre', but I haven't found it yet.