Konstantin "Koča" Popović was a Serbian and Yugoslav politician and communist volunteer in the Spanish Civil War, 1937–1939 and Divisional Commander of the First Proletarian Division of the Yugoslav Partisans. He is on occasion referred to as "the man who saved the Yugoslav Partisans", because it was he who anticipated the weakest point in the Axis lines on the Zelengora–Kalinovik axis, and devised the plan for breaking through it during the Battle of Sutjeska, thus saving Josip Broz Tito, his headquarters and the rest of the resistance movement. After the war, he served as the Chief of the General Staff of the Yugoslav People's Army, before moving to the position of Minister of Foreign Affairs and spent the final years of his political career as Vice President of Yugoslavia.

The Chief of the General Staff of Yugoslavia refers of the chief of the General Staff of the Royal Yugoslav Army from 1918 to 1941, the Yugoslav People's Army from 1945 to 1992 and the Armed Forces of Serbia and Montenegro from 1992 to 2006.