As a kid, i remember watching a film that had scenes in Yugoslavia, during some type of war, that in one scene involved a helicopter that emitted a sound that was deafening to the enemy. The era was 1970-1985 era. The movie was in english, but took place over seas. The one caputere was the scene in yugoslavia. Not sure if this movie was some type of spy movie. Very interested in any ideas. Ryan  : capresq@hotmail.com