The Arizona Army National Guard is a component of the United States Army and the United States National Guard. Nationwide, the Army National Guard comprises approximately half of the U.S. Army's available combat forces and approximately one third of its support organization. National coordination of various state National Guard units are maintained through the National Guard Bureau. The Army National Guard is composed primarily of traditional Guardsmen -- civilians who serve their country, state and community on a part-time basis (usually one weekend each month and two weeks during the summer.) Each state, territory and the District of Columbia has its own National Guard, as provided for by the Constitution of the United States. The National Guard has a unique dual mission that consists of both Federal and State roles. For state missions, the governor, through the state Adjutant General, commands Guard forces. The governor can call the National Guard into action during local or statewide emergencies, such as storms, fires, earthquakes or civil disturbances. In addition, the President of the United States can activate the National Guard for participation in federal missions. Examples of federal activations include Guard units deployed to Kosovo and the Sinai for stabilization operations, and units deployed to the Middle East and other locations in the war on terrorism.