The effects of the Second World War made collective security a priority for Belgian foreign policy. In March 1948 Belgium signed the Treaty of Brussels and then joined NATO in 1948. However, the integration of the armed forces into NATO did not begin until after the Korean War. The Belgians, along with the Luxembourg government, sent a detachment of battalion strength to fight in Korea known as the Belgian United Nations Command. This mission was the first in a long line of UN missions which the Belgians supported. Currently, the Belgian Marine Component is working closely together with the Dutch Navy under the command of the Admiral Benelux.