Cal. Military and Veterans Code § 161

Within the Military Department, the office of the Adjutant General consists of one officer of the rank of lieutenant general who is the Adjutant General, one officer of the rank of major general who is the Deputy Adjutant General, one officer who may be of the rank of brigadier general who is the Assistant Adjutant General, Army, one officer who may be of the rank of brigadier general who is the Assistant Adjutant General, Air, one officer who may be of the rank of brigadier general who is the Chief of Staff and Director of the Joint Staff, and other officers as are prescribed by the laws or regulations of the United States. No person is eligible for appointment as the Deputy Adjutant General unless the person has not less than a total of five years of commissioned service in the National Guard of the United States, of which at least three years shall be service as a field grade officer in the California National Guard within the preceding 10-year period prior to the date of appointment and of which at least three years shall have been in command of army or air troops at the battalion or equivalent or higher command level or three years as a staff officer at brigade or equivalent or higher staff level. The Deputy Adjutant General is subordinate only to the Governor and the Adjutant General and shall have their duties assigned by the Adjutant General.