 Haile Selassie was deposed in 1974, and during the Communist-run governments of the Provisional Military Administrative Council or Derg of 1974 to 1977 and of Mengistu Haile Mariam that followed from 1977 to 1991, the Ethiopian Navy – no longer "Imperial" – was reoriented toward the Soviet Union.Officers continued to train in Ethiopia, but selected naval officers continued their studies at the Soviet naval academy in Leningrad and at Baku.After the Soviet Union was expelled from Somalia for supporting Ethiopia against Somalia in the Ogaden War in 1978, it established naval bases at Assab and on the Dahlak Islands and began to base Soviet Naval Aviation aircraft at Asmara International Airport; in addition, Soviet naval personnel took posts as instructors at the Ethiopian naval academy.