Military
His theme was echoed by Gustavus Adolphus.
Ethics of warfare have developed since 1945, to create constraints on the military treatment of prisoners and civilians, primarily by the Geneva Conventions; but rarely apply to use of the military forces as internal security troops during times of political conflict that results in popular protests and incitement to popular uprising.
International protocols restrict the use, or have even created international bans on some types of weapons, notably weapons of mass destruction (WMD). International conventions define what constitutes a war crime, and provides for war crimes prosecution. Individual countries also have elaborate codes of military justice, an example being the United States' Uniform Code of Military Justice that can lead to court martial for military personnel found guilty of war crimes.
Military actions are sometimes argued to be justified by furthering a humanitarian cause, such as disaster relief operations to defend refugees; such actions are called military humanism.

See also: Armed forces of the world
List of countries by number of military and paramilitary personnel
List of countries by level of military equipment
List of countries by Global Militarization Index
List of countries without armed forces
List of countries by military expenditures
List of countries by past military expenditure
List of countries by military expenditure per capita
List of militaries by country
List of air forces
Lists of armies
List of navies

References: 

External links: 
Military Expenditure % of GDP hosted by Lebanese economy forum, extracted from the World Bank public data.
Military at Curlie