 Zaharije Ostojić ( Serbian Cyrillic : Захарије Остојић ; 1907 – April 1945 ) was a Montenegrin Serb military officer who served as the chief of the operational , organisational and intelligence branches of the Chetnik Supreme Command led by Draža Mihailović in Yugoslavia during World War II . He was a major in the Yugoslav Royal Air Force prior to the Axis invasion of Yugoslavia in April 1941 , and was the second-highest-ranking Chetnik officer after Mihailović.егојe Ostojiћ was born in 1907 in the village of Gornja Poljana near Podgorica , Monten