National defense is a nation's use of military, economic and political power to maintain survival.
National defense or national defence may also refer to: National Defense (Poland), a volunteer military formation of the Second Polish Republic National Defense (magazine), a business and technology magazine published by the National Defense Industrial Association National missile defense, a military strategy to shield a country from missiles Movement of National Defence, a Greek government during WWI
See also Ministry of defence, part of a government responsible for matters of defence National security (disambiguation) Defense (disambiguation) National Defence Academy (disambiguation) National Defence University (disambiguation)