Oregon Revised Statutes Military Affairs; Emergency Services § 399.065

(1) The Governor shall have the power, in case of invasion, disaster, insurrection, riot, breach of the peace, or imminent danger thereof, to order into active service of the state for such period, to such extent and in such manner as the Governor may deem necessary all or any part of the organized militia. Such power shall include the power to order the organized militia or any part thereof to function under the operational control of the United States Army, Navy or Air Force commander in charge of the defense of any area within the state which is invaded or attacked or is or may be threatened with invasion or attack.

(2) The Governor may order into active service of the state for such period, to such extent and such manner as the Governor may deem necessary units or individuals of the organized militia when in the judgment of the Governor the services of such units or individuals are required for the furtherance of the organization, maintenance, discipline or training of the organized militia or for ceremonial functions of the state government.

(3) Whenever any portion of the organized militia is employed pursuant to this section, the Governor, if in the judgment of the Governor the maintenance of law and order will thereby be promoted, may by proclamation declare the county or city in which the troops are serving, or any specified portion thereof, to be under martial law.