Canada has often carried out its foreign policy through coalitions and international organizations, and through the work of numerous federal institutions. Under the aegis of Canadian foreign policy, various departments and agencies conduct their own international relations and outreach activities. For example, the Canadian Forces and the Department of National Defence conduct defence diplomacy in support of national interests, including through the deployment of Canadian Defence Attachés, participation in bilateral and multilateral military forums (e.g., the System of Cooperation Among the American Air Forces), ship and aircraft visits, military training and cooperation, and other such outreach and relationship-building efforts.