The research reported in this document has been sponsored by the Air Force Office of Scientific Research, OAR, under Contract AF61 (052)‐640 with the European Office of Aerospace Research, United States Air Force; by the Aeronautical Systems Division of the Air Force Systems Command, United States Air Force, through the European Office of the Office of Aerospace Research, under Contract AF61(052)‐402, and by the US Department of the Army, through its European Research Office, under Contract No. DA‐91‐591