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Someone else declared that Oswald was an expert marksman.
You can be an "expert marksman" as a general description, but you can't be both an Expert and a Marksman in the Marine Corps. Two distinct classes.

Oswald was a below average shot with a crappy gun.
BS. Even if Oswald was only a Marksman in boot camp (and I think he was actually a Sharpshooter) - 1) he re-qualified at least two or three more times during his tour; 2) he was not below average (Marksman is average); 3) if you haven't been through Parris Island, then you don't have a clue how good even a Marksman can shoot.
The closest a Marine gets to a target is 200 yards, then moves back to 300 yards, then back again to 500 yards. No scopes allowed.
Oswald was less than a 100 yards from JFK and he had a scope.