In Belgium, the Belgian military's responsibilities include territorial defense, humanitarian/disaster relief, assistance to the police if required, international peacekeeping missions, and support to its NATO and EU security commitments, which Belgium considers vital components of its national security policy; outside of the country, the military operates almost always within an international organization or a coalition; Belgium was one of the original 12 countries to sign the North Atlantic Treaty (also known as the Washington Treaty) establishing NATO in 1949; it hosts the NATO headquarters in Brussels; Belgium also cooperates bilaterally with neighboring countries, such as Luxembourg and the Netherlands, in conducting joint patrols of their respective air spaces and in a composite combined special operations command with Denmark and the Netherlands (2025)