The Department of Defence (or Department of Defense) is a department within the governments of a number of countries. It may refer to:

National security is the requirement to maintain the survival of the state through the use of economic, diplomacy, power projection and political power. The concept developed mostly in the United States of America after World War II. Initially focusing on military might, it now encompasses a broad range of facets, all of which impinge on the non military or economic security of the nation and the values espoused by the national society. Accordingly, in order to possess national security, a nation needs to possess economic security, energy security, environmental security, etc. Security threats involve not only conventional foes such as other nation-states but also non-state actors such as violent non-state actors, narcotic cartels, multinational corporations and non-governmental organisations; some authorities include natural disasters and events causing severe environmental damage in this category.

Measures taken to ensure national security include:

There is no single universally accepted definition of "National Security" since there are some differences on describing National as State and everything consist in a nation. The variety of definitions provide an overview of the many usages of this concept. The concept still remains ambiguous, having originated from simpler definitions which initially emphasised the freedom from military threat and political coercion to later increase in sophistication and include other forms of non-military security as suited the circumstances of the time.

Paul W. Dewar, MP (born January 25, 1963) is a Canadian educator and politician from Ottawa, Ontario. He is the New Democratic Party (NDP) Member of Parliament (MP) for the riding of Ottawa Centre.

Dewar was first elected to the House of Commons in the 2006 federal election. He served as the Official Opposition Critic for Foreign Affairs, until he left the post in October 2011 to run for the leadership of the NDP. Before entering politics he worked as a teacher and was an elected representative of the Ottawa-Carleton Elementary Teachers' Federation.

Paul Dewar was born in Ottawa, Ontario on January 25, 1963 to parents Ken Dewar and former Ottawa mayor and New Democratic Member of Parliament, Marion Dewar. When he was in grade three, Dewar was diagnosed with dyslexia, after his teacher noticed that he was struggling to read and write. He earned a Bachelor of Arts degree from Carleton University in political science and economics in 1985.

Not long after he completed his Bachelor of Arts, Dewar embarked on a five-month trip to Nicaragua, where he volunteered as an aid worker. Following his return to Ottawa, he began working as constituency assistant to Ontario Minister of Health and NDP Member of Provincial Parliament for Ottawa Centre, Evelyn Gigantes. Dewar served in this position from 1990 to 1995.^{[citation needed]} It was during this time that he met his wife, Julia Sneyd. They later had two children together: Nathaniel and Daniel.

Jacob Gedleyihlekisa Zuma (born 12 April 1942) is the President of South Africa,elected by parliament following his party's victory in the 2009 general election.

Zuma is the President of the African National Congress (ANC), the governing political party, and was Deputy President of South Africa from 1999 to 2005. Zuma is also referred to by his initials JZ and his clan name Msholozi. Zuma became the President of the ANC on 18 December 2007 after defeating incumbent Thabo Mbeki at the ANC conference in Polokwane. Zuma was also a member of the South African Communist Party (SACP), briefly serving on the party's Politburo until he left the party in 1990. On 20 September 2008, Thabo Mbeki announced his resignation after being recalled by the African National Congress's National Executive Committee, following a conclusion by Judge Nicholson of improper interference in the National Prosecuting Authority (NPA), including the prosecution of Jacob Zuma for corruption.

Zuma has faced significant legal challenges. He was charged with rape in 2005, but was acquitted. In addition, he fought a long legal battle over allegations of racketeering and corruption, resulting from his financial advisor Schabir Shaik's conviction for corruption and fraud. On 6 April 2009, the National Prosecuting Authority decided to drop the charges, citing political interference.