Like all Marines, Oswald was trained and tested in shooting and he scored 212 in December 1956, 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 accidentally shooting himself in the elbow with an unauthorized .22 handgun, then court-martialed again for fighting with a sergeant who he thought was responsible for his punishment in the shooting matter.