Officially Licensed USMC Quantico Weapons Training Battalion Patch Backing:Without Hook & Loop 000 mishap-free hours by July

000 mishap-free hours by July 2010 — equivalent to nearly 70

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US Navy Officer's Crest — the mark of a commissioned officer

Officially Licensed USMC Quantico Weapons Training Battalion Patch Backing:Without Hook & Loop 000 mishap-free hours by JulyOfficially Licensed USMC Quantico Weapons Training Battalion (WTBn) patch. Every Marine a rifleman Quantico WTBn writes the doctrine. Weapons Training Battalion (WTBn) at Marine Corps Base Quantico, Virginia is the Marine Corps' proponent for all facets of small arms combat marksmanship the focal point for marksmanship doctrine, training, competition, equipment, and weapons in the Corps. WTBn writes and publishes the marksmanship training circulars