<Tr> <Th> Executed by </Th> <Td> United States Canada </Td> </Tr> <Tr> <Th> Outcome </Th> <Td> Ongoing </Td> </Tr> <P> Operation Noble Eagle (ONE) is the United States and Canadian military operation related to homeland security and support to federal, state, and local agencies . The operation began 14 September 2001, in response to the September 11 attacks . </P> <P> Operation Noble Eagle began with the mobilization of thousands of National Guard and reserve personnel to perform security missions on military installations, airports and other potential targets such as bridges, power plants, and port facilities . These reservists were called to active duty under a mobilization authority known as a partial mobilization (10 USC 12302). In a time of national emergency declared by the President, partial mobilization authorizes the President to order members of the ready reserve to active duty for a period not to exceed 24 consecutive months . Additionally, in 2001 and 2002, thousands of members of the national guard were activated at the order of their respective governors to provide additional security at airports . They were called up under Title 32 of the U.S. Code, which means they were under state control, but with federal pay and benefits . The Royal Canadian Air Force assisted in providing defense of the northern border of the United States . The United States Army's 759th Military Police Battalion, 144th Military Police Company and the 177th Military Police Brigade were assigned the task of protecting the White House, the Pentagon and the Capitol, along with other Army National Guard units that were tasked with augmenting the Air Force's air defense perimeter around the National Capital Region . </P>

What was the purpose of operation noble eagle