The Importance of National Security In today’s rapidly changing world, one of the most important issues is national security. It is the responsibility of a nation’s government to protect it’s land and it’s citizens from outside threats. Unfortunately, the way the world is today, for the US, national security requires nuclear weapons and technology. Back in the 1960’s, the nuclear power country club was rather small and very elite. It consisted of the Soviet Union, Great Britain, France and the US. In 1962, these snobby countries signed a treaty which banned the testing of nuclear weapon