Leather that is not buffed is called âfull grainâ because the natural grain retains its markings and characteristics. BYCAST â A split leather with a polyurethane protective coating. Like splits, bycast leather is inferior as it lacks the natural characteristics, elasticity and durability of top grain leather.
Marine Corps Gunnery Sergeant. Gunnery Sergeant Marine Corps Military Ranks. A Gunnery Sergeant in the United States Marine Corps is a specialized non-commissioned officer who manages firepower and logistics for a company-sized unit of Marines. The rank of Gunnery Sergeant is unique to the Marine Corps, and was introduced in the 19th century.
One is a command billet and the other is an MOS support billet. A command billet will take precedence if all other factors are equal (time in grade, time in service). Most Gunnery Sergeant promotees are evaluated against their career track and asked what they would like to be.