Final answer:
Personnel who qualify as Sharpshooters are authorized to wear a bronze 'S' on the Navy Rifle and Pistol Marksmanship ribbon bars.
Step-by-step explanation:
On the Navy Rifle and Pistol Marksmanship ribbon bars, personnel who qualify as Sharpshooters are authorized to wear a bronze 'S'. The various marks that can be placed on the ribbon denote different levels of proficiency, with the bronze 'S' specifically indicating the designation of Sharpshooter. Higher qualifications would have different devices, such as a silver 'E' for expert, but for Sharpshooters, the correct device is the bronze 'S'.