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vcdgrips, I'm not going to out anything GardoneVT doesn't want to put out, but as a fairly long time forum member and a veteran of almost 10 years, this is certainly "my lane". And having said that, I'm comfortable with his assertions.
I have served in Combat Arms, Military LE, and Aircrew. I was also a Mission Director in a Task Force. I had a lot of Officers who I would follow into a wall of fire without even needing anything more than "on me". I also had a lot more Officers, Junior and Senior I wouldn't follow to the chow hall. I've had an Officer leave me trapped in a burning vehicle, I've had Officer's fall asleep on radio watch,EVERY night. Sometimes it's as simple as having to repeatedly them that "hey, you and I eat last".
The aforementioned Officers all attained 0-6 or better, due the the fact that they were "Rabbi'ed up". These are just a few of the experience's I can talk about. Just like real life, it's often easier to promote up, rather than out. And this will continue as long as we draw our folks from the pool of humanity.
The sad thing is, I saw a lot of really good Officer's, I mean leadership I was in awe of, never get past 0-3 or 0-4.