The term 'Marine Rank' refers to the hierarchical structure of the United States Marine Corps. The highest rank is General, followed by Lieutenant General, Major General, Brigadier General, Colonel, Lieutenant Colonel, Major, Captain, First Lieutenant, Second Lieutenant, and Sergeant. Sergeant is an 8-letter word and is the lowest commissioned officer rank in the Marine Corps. Sergeants are responsible for leading small units of Marines and providing guidance and instruction to junior enlisted personnel.