USNORTHCOM was established on 25 April 2002 when President George W. Bush approved a new Unified Command Plan, and attained initial operating capability on 1 October 2002.
Mission
According to the UCP, Northern Command's mission is to:
Conduct operations to deter, prevent, and defeat threats and aggression aimed at the United States, its territories, and interests within the assigned area of responsibility and,
As directed by the President or Secretary of Defense provide military assistance to non-military authorities including consequence management operations
Area of responsibility
USNORTHCOM's Area of Responsibility includes air, land and sea approaches and encompasses the continental United States, Canada, Mexico and the surrounding water out to approximately. It also includes the Gulf of Mexico, the Straits of Florida, portions of the Caribbean region to include The Bahamas, Puerto Rico, the U.S. Virgin Islands, the British Virgin Islands, Bermuda, and the Turks and Caicos Islands. The commander of USNORTHCOM is responsible for theater security cooperation with Canada, Mexico, and The Bahamas. In May 2011, NORTHCOM was mobilized in the wake of the BP oil spill in the Gulf of Mexico to provide air, ground, and logistical support. In October 2014, NORTHCOM took administrative control of Alaskan Command.
Note: The National Defense Authorization Act of 2008 stipulates that at least one deputy commander of USNORTHCOM be a National Guard general officer unless the commander is already such an officer. Commanders of U.S. Northern Command by branches of service
Air Force: 4
Navy: 3
Army: 1
Space Force: none
Marine Corps: none
Coast Guard: none
Planning and strategy
Northern Command has created several classified "concept plans" that are intended to address the 15 National Planning Scenarios that NORTHCOM must be prepared to respond to. However the GAO found that the national strategy to defend the United States is several years out of date.
The Posse Comitatus Act of 1878 and subsequent Department of Defense policy constrains any member of the United States Army, Air Force, Navy, or Marine Corps, and the National Guard under federal authority from domestically intervening in a law enforcement capacity on United States soil. Several exceptions to the law have been used in the past, including protecting the citizens' constitutional rights in the absence of state and/or local assistance, such as protecting the Little Rock Nine students in Little Rock, Arkansas in 1957, and using the Insurrection Act to quell civil disorders, such as the 1992 Los Angeles riots. The Military Commissions Act of 2006 lifted many restrictions placed on the military to support non-military authorities by the Posse Comitatus Act, however the United States Supreme Court ruled in June 2008 that significant portions of the MCA were unconstitutional. The "John Warner Defense Authorization Act of 2007" H.R. 5122 effectively nullified the limits of the Insurrection Act when it was passed; however, the bill was amended in 2008. On 1 October 2008, the 3rd Infantry Division’s 1st Brigade Combat Team was assigned to U.S. Northern Command, marking the first time an active unit had been given a dedicated assignment to Northern Command. The force will be known for the first year as a CBRNE Consequence Management Response Force, and will serve as an on-call federal response force for terrorist attacks and other natural or manmade emergencies and disasters.