“not an expert marksman...”
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I’ve always heard he was. But.... Wiki says this....
In December 1956, he scored 212, which was slightly above the requirements for the designation of sharpshooter. In May 1959 he scored 191, which reduced his rating to marksman. Oswald was court-martialed after he accidentally shot himself in the elbow with an unauthorized .22 caliber handgun.
Showed what one motivated Marine and his rifle can do.