Gunnery Sergeants in the Marine Corps are non-commissioned officers that manage firepower and logistics in a company-sized group of Marines. The rank was introduced into the Marine Corps in the 19th century and originally served on Naval ships helping wiith ammunition handling and firing procedures.
The insignia for Gunnery Sergeant is three chevrons with two rockers and the crossed rifles between the bottom chevron and the top rocker.
The gold stripes on red are worn on the Dress Blue uniform and the green stripes on red are worn on the Service uniform. The pins are worn on the collars of the uniform.