Oswald fired for score on several occasions so you'll have to be specific.
and I think they gave him the designation of marksman or maybe sharpshooter,
There's a difference betwen qualifying as Sharpshooter as opposed to Marksman in the Marine Corps but one can qualify as a Sharpshooter by one point and one can miss qualifying as a Sharpshooter by one point. Again you'll have to be specific. Most people could not qualify as either let alone as Expert.
Actually I have read that the majority of Marines qualify expert.