The Yugoslav People’s Army (YPA), also referred to as the Yugoslav National Army (YNA), was the military of the Socialist Federal Republic of Yugoslavia.
The origins of the JNA can be found in the Yugoslav Partisan units of World War II. As part of the antifascist People’s Liberation War of Yugoslavia, the People’s Liberation Army of Yugoslavia (NOVJ), a predecessor of the JNA, was formed in the town of Rudo in Bosnia and Herzegovina on 22 December 1941. After the Yugoslav Partisans liberated the country from the Axis Powers, that date was officially celebrated as the Day of the Army in the Socialist Federal Republic of Yugoslavia (SFR Yugoslavia).
In March 1945, the NOVJ was renamed the Yugoslav Army (Jugoslovenska Armija) and finally on its 10th anniversary on 22 December 1951, received the adjective “People’s” (Narodna).