C.R.S. § 28-3-304

Any person appointed, promoted, and commissioned on or after April 14, 1955, as an officer of the National Guard shall successively pass such examinations and tests as to his or her physical, moral, and professional fitness as are prescribed by federal law. Officers shall be commissioned by the governor, and the commissions shall designate the armed service, staff corps, or department in which they are appointed. They will be assigned to duty within each organization by the immediate commander thereof.