The Yugoslav Navy (Serbo-Croatian: Jugoslavenska Ratna Mornarica, Југословенска Pатна Mорнарица), was the navy of the Socialist Federal Republic of Yugoslavia. It was essentially a coastal defense force with the mission of preventing enemy landings along the Yugoslavia's rugged 4,000- kilometer shoreline or coastal islands, and contesting an enemy blockade or control of the strategic Strait of Otranto. In 1990 it had 10,000 sailors (4,400 conscripts), including 2,300 in 25 coastal artillery batteries and 900 marines in one light naval infantry brigade.