ВБА / VBA) is a Serbian military security and counterintelligence agency of Serbia, organizational unit of the Ministry of Defence.

Those measures were applied to select recruits, assess the behavior of soldiers in the unit, but also to prevent the disclosure of military secrets.

The first legal act in which the security issues of the armed forces were defined in a comprehensive way is the Military Law, adopted on 12 November 1839.

On 6 February 1876, a Department for Intelligence and Counterintelligence Tasks (Odeljenje za obaveštajne i kontraobaveštajne zadatke) was established within the General Staff of the Armed Forces of the Principality of Serbia.

Intelligence Department was in charge of suppressing enemy actions harmful to the interests of the army and the country, monitoring the writings of the domestic and foreign press, as well as research and the creation of military codes.

Following year it was succeeded by the Department for People's Protection (OZNA) which at first dealt with the collection of intelligence data for the needs of operational units, and later it increasingly turned to the fight against espionage.

On 13 March 1946, the Third Section of OZNA was abolished and replaced with newly-formed the Counterintelligence Service - KOS (Kontraobaveštajna služba).

[3] In 1955, the counterintelligence service was renamed the Security Directorate (Uprava bezbednosti) and has been subordinated to the Federal Secretariat for National Defence.

Within its jurisdiction, the Military Security Service was responsible for: security and counterintelligence protection of the commands, units and institutions of the Armed Forces of Serbia and Montenegro and the Federal Ministry of Defence; counterintelligence protection of the highest-ranking military officers and officials of defence ministry; organizing and carrying out preventive security work in the commands, units and institutions of the Armed Forces of Serbia and Montenegro; implementation and control of data protection measures; carrying out security checks of persons for admission to work of the Armed Forces of Serbia and Montenegro and the Federal Ministry of Defence.