I knew a guy in basic who'd been an SF medic, and then pulled the plug... Didn't like the civilian world, but it was the 1980s, and they made him go through basic again.
He'd been an e-6 or an e-7 or somesuch. He was right at 35 years old.
And he was good - we went to him before we went to sick call, except for when we were purely determined to be on goldbricking status... And he got dragged around the running qualifications, because his knees were shot.
Most of the way through basic, since we were the #1 platoon in the #1 company in the training battalion, we got an on-post beer pass. And the DIs let the prior service guys get any sew-ons that they deserved. So we took him over to clothing sales, got him his stuff, and then boogied to the e-club and played catch-up drinking...
And then some MP trainees came in, saw a shaved-head basic trainee with a bunch of sew-ons, and proceeded to try to remove them. It was just a beautiful thing to watch.
When we weaved back to the company area, we got screamed at for an extended period of time because some MP trainees had been damaged, and they didn't know who did it. The screaming was administered by the first sergeant, with the bill of his cap about 1/4" from the guy's nose...
I'm pretty sure the DIs got a gigglesnort out of the incident.