Medaković was a friend of Knin chief of police Milan Martić, and was an employee of Krajina state security. Captain Dragan visited Krajina in the autumn 1990. There, he met Martić and claimed that the defence of Krajina appeared "very disorganised". He thus decided to help organise the Krajina defence. On his return to Belgrade, he attempted to gather support for his effort, and became a member of the opposition Serbian Renewal Movement. He then returned to the United States to complete his aviator training.