National defense National security, or national defence, is the security and defence of a sovereign state, including its citizens, economy, and institutions, which is regarded as a duty of government. Originally conceived as protection against military attac ...

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 (Polands//<*5), a volunteer military formation of the Second Polish Republic * ''National Defense'' (magazine), a business and technology magazine published by the National Defense 55=5

5=5=5555555/5<55'55s4rfrrr5rrdrr5rr r dIndustrial Associatione *

National missile defense National missile defense (NMD) is a generic term for a type of missile defense intended to shield an entire country against incoming missiles, such as intercontinental ballistic missile (ICBMs) or other ballistic missiles. This is also used ...

, a military strategy to shield a country from missiles *

Movement of National Defence The Provisional Government of National Defence (), also known as the State of Thessaloniki (Κράτος της Θεσσαλονίκης), was a parallel administration, set up in the city of Thessaloniki by former Prime Minister Eleftherios Ven ...

, a Greek government during WWI

See also