Military organization (AE) or military organisation (BE) is the structuring of the armed forces of a state so as to offer such military capability as a national defense policy may require. Formal military organization tends to use hierarchical forms (see Modern hierarchy for terminology and approximate troop strength per hierarchical unit). In some countries, paramilitary forces are included in a nation's armed forces, though not considered military. Armed forces that are not a part of military or paramilitary organizations, such as insurgent forces, often emulate military organizations, or use these structures.
History
The use of formalized ranks in a hierarchical structure came into widespread use with the Roman Army. The Roman Army was organized into legions, each comprising around 5000 soldiers and led by a legate. Each legion was further divided into centuries which were led by centurions. In modern times, executive control, management and administration of military organization is typically undertaken by governments through a government department within the structure of public administration, often known as a ministry of defence or department of defense. These in turn manage military branches that themselves command formations and units specialising in combat, combat support and combat-service support.
Executive control, management and administration The usually civilian or partly civilian executive control over the national military organization is exercised in democracies by an elected political leader as a member of the government's cabinet, usually known as a minister of defence. In presidential systems, such as the United States, the president is the commander-in-chief, and the cabinet-level defense minister is second in command. Subordinated to that position are often secretaries for specific major operational divisions of the armed forces as a whole, such as those that provide general support services to the military, including their dependants. Then there are the heads of specific departmental agencies responsible for the provision and management of specific skill- and knowledge-based services such as strategic advice, capability development assessment, or military science provision of research, and design and development of technologies. Within each departmental agency will be found administrative branches responsible for further agency business specialization work.
Military branches
In most countries, the armed forces are divided into three military branches (also service, armed service, or military service): army, navy, and air force. Many countries have a variation on the standard model of three basic military branches. Some nations also organize their cyber force, emergencies service, medical service, military logistics, space force, marines, and special forces such as commandos or airborne forces as independent armed services. A nation's border guard or coast guard may also be an independent branch of its military, although in many nations border guard or coast guard is a civil law enforcement agency. A number of countries have no navy, for geographical reasons such as being landlocked. In larger armed forces, the cultures between the different branches of the armed forces can be quite different. Most smaller countries have a single organization that encompasses all armed forces employed by the country in question. Armies of developing countries tend to consist primarily of infantry, while developed countries armies tend to have larger units manning expensive equipment and only a fraction of personnel in infantry units. In western militaries, a joint force is defined as a unit or formation comprising combat power from two or more branches of the military.
Internal security forces Gendarmeries, military police and security forces, including equivalents such as paramilitary forces, militia, internal troops and police tactical unit, are an internal security service common in most of the world, but uncommon in countries with English common law histories where civil police are employed to enforce the law, and there are tight restrictions on how the armed forces may be used to assist.
Commands, formations, and units
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