Lyndon Johnson actually said...
Now, Therefore, I, Lyndon B. Johnson, President of the United States of America, acting under and by virtue of the authority vested in me by Section 6 of the Act of June 30, 1944, do find and declare that the powers and privileges provided in that Act to implement the jurisdiction of courts martial or other military tribunals of friendly foreign forces within the United States are necessary for the maintenance of discipline of the military, naval, or air forces of Australia within the United States.
10/09/1965