 Zaharije Ostojić was a Montenegrin Serb , and was born in 1907 in the village of <unk> Do , near the Adriatic seaport of Bar in the Principality of Montenegro . He joined the Yugoslav Royal Air Force and prior to the outbreak of World War II had risen to the rank of major . Little else is known of Ostojić 's early life , but his sister was married to Royal Yugoslav Army Brigadier General Ljubo Novaković . 
