I agree with Captain MJ...so many...
They're all "similar" so an example I'll give of the finest mentor I had (and I had a bunch of great ones): Steve Lorenz.
Steve's a unique guy: you either LOVE him and would follow him to the gates of hell just to see if they're hot, if he asked. Or you HATE/LOATH/DESPISE him. I never quite understood that part...the man to me was/is amazing. But we can't all be "loved" by everyone. Anyway, he can see things that others can't, he makes decisions quickly and almost always accurately, BUT if he makes a mistake, he's the FIRST to stand up and say "Boy, I blew that one, didn't I!"
The best example that truly reinforced the role of a senior officer/mentor/leader to me was this. I was his exec...a young captain, he was the group commander (Col) at the time. He called me on a Monday morning at 0600..."Steve...I need to see you ASAP!" So I climbed out of bed and in I went. He hands me a STACK of information, data, etc., and says "I need a presentation covering all this; no more than about 15 slides...call me if you have any questions, etc., and I need this Thursday at close of business.
"Yes sir!"
SO...imagine how many hours I spent doing that, as well as training pilots, and performing my other duties. And I turned it in to him late Thursday.
"Thanks Steve, I appreciate it" (BIG SMILE)
The next morning I'm briefing two new pilots for a training sortie the following day when I get a call: "Report to Col Lorenz immediately." Okay guys, take an hour...
I rush over (what have I done wrong, examine all sins...) and knock on his briefing room door; he opens it.
"Captain Steve...thank you for coming...(takes me in to the briefing room he's in). Gentlemen, this is Captain Steve, he put together that excellent briefing I just gave, I thought if you had any questions, he'd be your expert!"
A 3 Star General
A 2 star general
TWO 1 star generals
And several colonels and lesser Gods (I was a captain then).
And all I got were a few questions, easily answered and some handshakes and nice compliments. And as I looked over to the corner, there was Steve Lorenz, leaning against the wall with a big smile on his face.
I gained SO much confidence at that moment...and "IT" all made sense: he knew this stuff cold, could have done this in an afternoon, but he let me do it, learn it, and then prepare the briefing for the numbered air force commander and his staff...and then he presented me to them saying "THIS officer did this work, NOT ME..."
"There is no I in team, always challenge your people, aid/assist/advise/mentor them, let them make mistakes, then help them learn from them rather than criticize, reward and praise publicly, reprimand privately, never forget you were once where they are...remember that they will replace you one day!"
I become a MUCH better officer just from that one day and my entire time working for Steve Lorenz.
Oh, he finished his career a year ago and I think he did pretty well...
http://www.af.mil/information/bios/bio.asp?bioID=6234
I have almost every article he's written on leadership...and I'm proud to say some of them I have his original on yellow notepad paper...
Steve
USAFA ALO
USAFA '83