Communist states have established two types of civil-military systems. The armed forces of most socialist states have historically been state institutions based on the Soviet model, but in China, Laos, North Korea and Vietnam the armed forces are party-state institutions. However, there are several differences between the statist (Soviet) model and the party-state model (China). In the Soviet model, the Soviet armed forces was led by the Council of Defense (an organ formed by the Presidium of the Supreme Soviet of the Soviet Union) while the Council of Ministers was responsible for formulating defense policies. The party leader was "ex officio" the Chairman of the Council of Defense. Below the Council of Defense, there was the Main Military Council which was responsible for the strategic direction and leadership of the Soviet armed forces. The working organ of the Council of Defense was the General Staff which was tasked with analysing military and political situations as they developed. The party controlled the armed forces through the Main Political Directorate (MPD) of the Ministry of Defense, a state organ that functioned "with the authority of a department of the CPSU Central Committee." The MPD organised political indoctrination and created political control mechanism at the center to the company level in the field. Formally, the MPD was responsible for organising party and Komsomol organs as well as subordinate organs within the armed forces; ensuring that the party and state retains control over the armed forces; evaluates the political performance of officers; supervising the ideological content of the military press; and supervising the political-military training institutes and their ideological content. The head of the MPD was ranked fourth in military protocol, but it was not a member of the Council of Defense. The Administrative Organs Department of the CPSU Central Committee was responsible for implementing the party personnel policies and supervised the KGB, the Ministry of Internal Affairs and the Ministry of Defense.