Why does it matter what a pilots background is?????? If he's in my right seat.......it means he has passed training....and IOE. If, in my opinion, he is diffecient in some area........then somebody in OUR training department dropped the ball....and let them through. If proceedures are not being followed.......then it's my job to make sure they are. If something comes into question.....we..(flight CREW) look it up. I prefer it be a question of what's right....not whose right, because sometimes....... I make a mistake.
I'm in the left seat because of seniority....not because of such superior flying skills the company had no choice. I was new once. I had some really good mentor Capt's that could careless what my background was.......it think it only fair that I return the favor.
If you happen to fly with a turd....blame the training dept........not the military.....or civie backgrounds.