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.
A Sergeant Instructor (Gunnery Sergeant) of the U.S. Marine Corps corrects an officer candidate. A Drill Instructor is a non-commissioned officer in the armed forces or police forces with specific duties that vary by country. For example, in the United States armed forces, they are assigned the duty of training new recruits entering the military. 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.