I am continually amazed at the ignorance of some people.
This clown was a aircraft fixer, not a sniper. Marine snipers are not airwingers. They are mostly grunts who go through sniper school. Also, a Marine who qualifies as a "marksman" with the service rifle is qualified at the lowest possible level. Below marksman is "unqualified." Above marksman is "sharpshooter" and above that is the top, "expert."
Also, if he was discharged as a lance coolee, the chances are pretty fair he did not finish his full tour in the Corps and was a %#$!bird who got office hours and had other discipline problems.