Sniper

A Sniper is a person adept at utilizing as well as maintaining range weaponry.

Role and Abilities
Much like musicians, snipers, in the series are an optional and alternative occupation for any Marine or pirate. Due to their choice of weaponry, snipers excel best at long-range combat. Weapons that most snipers prefer to utilize include rifles and pistols, but can also include artillery such as cannons and mortars and highly customized weapons that best suits the sniper's skill.

Translation and Dub Issues
Snipers have been referred to as Sharp-Shooters in the FUNimation Dub such as Sanji referring to Usopp as such when he confronted Mr. 2 in Alabasta. This renaming was abandoned in the later English dubbed episodes as Foxy at the beginning of the Davy Back Fight identified Usopp as a "Sniper".

Trivia

 * Given the nature of their skills some snipers such as Usopp, may also double as their crews' gunner, responsible for operating and maintaining their ship's cannons and artillery.