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United States Marine Corps Scout Sniper (MOS 0317, formerly 8541) is a secondary MOS (Military Occupational Specialty) designator of U.S. Marine Corps infantrymen and reconnaissance Marines that have graduated from a U.S. Marine Corps Scout Sniper School. Scout Snipers must earn the rank of Lance Corporal, be selected by their battalion to join the scout-sniper platoon, and complete an approved scout-sniper course in order to receive this designation.
https://en.wikipedia.org/wiki/United_States_Marine_Corps_Scout_Sniper