The Alabama National Guard is the National Guard of the U.S State of Alabama, and consists of the Alabama Army National Guard and the Alabama Air National Guard. (The Alabama State Defense Force is the third military unit of the Alabama Military Department, part of the Government of Alabama.) The Constitution of the United States specifically charges the National Guard with dual federal and state missions. The state functions range from limited actions during non-emergency situations to full scale law enforcement of martial law when local law enforcement officials can no longer maintain civil control.