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.
Drill instructors within the U.S. armed forces have different titles in each branch of service. In the United States Air Force, they are known as Military Training Instructors, or MTIs. The United States Navy refers to their drill instructors as Recruit Division Commanders, or RDCs. Within the United States Army, drill instructors are given the title of Drill Sergeant. The United States Coast Guard gives the title of Company Commander to their drill instructors.