General Karl Hilmer Lennart Ljung (13 March 1921 – 19 November 1990) was a Swedish Army officer who served as Supreme Commander of the Swedish Armed Forces from 1978 to 1986. During Ljung's eight years as Supreme Commander many events of importance for Swedish security and defense policy occurred. Sweden had five different governments under four prime ministers from different political sides. Olof Palme was murdered, the submarine incidents culminated with the Soviet submarine "U 137" running aground in Karlskrona and the decision of developing a new fighter aircraft came through.