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Oklahoma National Guard, a division of the Oklahoma Military Department, is the component of the United States National Guard in the U.S. state of Oklahoma. It comprises both Army (OKARNG) and Air (OKANG) National Guard components. The Governor of Oklahoma is Commander-in-Chief of the Oklahoma National Guard when not on federal active duty. The state's highest-ranking military commander, the Adjutant General of Oklahoma (TAG), serves as the military head of the Guard and is second only to the Governor. The TAG is served by Assistant Adjutants General, all brigadier generals, from the OKARNG and OKANG. The two components each have a senior noncommissioned officer, State Command Sergeant Major for Army and State Command Chief Master Sergeant for Air. The TAG is also served by his Director of the Joint Staff or Chief of Staff, who has direct oversight of the state's full-time National Guard military personnel and civilian employees.