Went to boot camp qual'ed on the rifle range, washed out after.
Your scenario makes sense except for the term “sharpshooter”. I don’t know anything about the military, but I have a hard time picturing someone just in boot camp being trained as a sharp shooter. Wouldn’t that be some specialized training pursued after boot camp? (And I apologize to any Marines if “boot camp” is the wrong term.)
Of course, we need to consider that in what today passes for journalism “sharpshooter” could have all sorts of definitions.