Robert M. Gates, Deputy Director of Intelligence to Executive Director, Central Intelligence Agency, "DDI Participation in NINES LIVES IV and IVY LEAGUE 82 Exercises," 14 April 1982, enclosing memoranda, including John N. McMahon, Executive Director, Central Intelligence Agency, to Deputy Director for Intelligence, Director, National Intelligence Emergency Planning Staff, and EXDIR/Planning Staff, "IVY LEAGUE 82," 20 March 1982, and Memorandum for the Record by [Excised], "Thoughts on Participation in Exercise Nine Lives # 4," 5 April 1982, Secret, excised copy