A border guard of a country is a national security agency that performs border security. Some of the national border guard agencies also perform coast guard and rescue service duties.
Soviet Border Troops riding horses patrol at the Khorgos Soviet-Chinese frontier post (1984 photo)
Chinese border guards' booth on the sea coast in Guangdong.
A Border Guard Bangladesh Senior Warrant Officer (left in yellow/green outfit) applies a mechanical advantage control/hold to a US Marine during training.
CBSA Inland Enforcement Officers
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 attack, national security is widely understood to include also non-military dimensions, such as the security from terrorism, minimization of crime, economic security, energy security, environmental security, food security, and cyber-security. Similarly, national security risks include, in addition to the actions of other nation states, action by violent non-state actors, by narcotic cartels, organized crime, by multinational corporations, and also the effects of natural disasters.
President of the United States Ronald Reagan in a briefing with US National Security Council staff on the Libya bombing on 15 April 1986
Security measures are taken to protect the Palace of Westminster in London, UK. The heavy blocks of concrete are designed to prevent a car bomb or other device being rammed into the building.
The SUPO headquarters in Punavuori, Helsinki
Refugees fleeing war and insecurity in Iraq and Syria arrive at Lesbos Island, supported by Spanish volunteers, 2015.