; or (2) to apply to those activities approved and reported pursuant to section 503 of the National Security Act of 1947 ( 50 U.S.C. 3093 ). 6. Definition In this Act, the term introduction of United States Armed Forces includes the assignment of members of such Armed Forces to command, coordinate, participate in the movement of, or accompany the regular or irregular military forces of any foreign country or government when such military forces are engaged, or there exists an imminent threat that such forces will become engaged, in hostilities.