The National Defence Act (NDA; French: Loi sur la défense nationale; LDN) is an Act of the Parliament of Canada, which is the primary enabling legislation for organizing and funding the military of Canada. The Act created the Department of National Defence, which merged the functions of the Department of Militia and Defence with the Department of the Naval Service and the Air Board, after its passage in 1922 and its implementation on 1 January 1923.