Unfortunately you don't get to serve only under the conditions you desire. You sign on the line and you're in for the duration of your contract (and maybe a little extra..). Sounds like this dude was underwhelmed by the US mil and went war hunting. I get it... but he could have pursued the same adventures by volunteering for different assignments.

Discharge under other-than-honorable conditions? Sure. Repay the cost of his education? Sure. 4 years confinement? Over the top.

On a barely related note, I was able to work a bit with the 13th DBLE in Djibouti (including attending their desert survival school). It was amazing how similar the Legion is the the USMC. The biggest difference is that our military cult is built on victory in battle and their's was built on glorious defeat.