Oregon Revised Statutes Military Affairs; Emergency Services § 399.415

(1) No person shall be appointed or promoted as a commissioned officer of the organized militia unless the person has passed such examination as to the physical, moral and professional qualifications of the person as may be prescribed by applicable federal and state laws and regulations.

(2) No person shall be recognized as a commissioned officer of the organized militia and no appointment as such shall become effective until the person has taken and subscribed an oath of office as prescribed by applicable federal and state laws and regulations. Such oath shall be taken and subscribed before an officer of the organized militia authorized to administer oaths as provided in ORS 399.150, or before a notary public.