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- War : A state of violent conflict which exists between two or more independent groups, each seeking to impose its will on the other.
- Grand strategy : The application of all national means of affecting the actions of other nations and non-national actors; specifically includes but is not restricted to military means
- Military strategy : The highest-level national concept of the use of pure military power, inlcluding setting the composition of the military and its deployment; high-level regional objectives in war; military research and setting military production priorities
- Joint warfare : Military operations by distinctly different arms of service (e.g., army, navy, long-range air forces, special operations) acting under common direction, with deconfliction and mutual support
- Army : Either the largest type of formation for a land-based military force, or the entirety of a nation's military force responsible for its land defenses.
- Air force : The part of a nation's military that is responsible, at the least, for long range air warfare.
- Naval infantry : Personnel assigned to naval ships, who are qualified to engage in combat using individual weapons, against enemy personnel on land or on ships that were boarded
- Navy : A military force organized primarily for missions on, under, or above bodies of water
- Special operations : Military or paramilitary operations that differ from conventional operations in degree of physical and political risk, operational techniques, mode of employment, independence from friendly support, and dependence on detailed operational intelligence and indigenous assets; they are often controlled at a national or strategic level of command
- Staff (military) : A military organization to extend the capabilities of a commander, by providing services from personal assistance to presenting alternative plans and managing the details of warfare
- Military academy : A general term for dedicated academic institutions for training officers for entry to a military service; may also refer to military-themed schools below the college level
- Staff college : Military-operated educational institutes that train midlevel officers to take on staff responsibilities beyond the small unit level; typical students are approximately at the rank major or equivalent, often junior majors or promising captains
- War college : Educational institutions operated by military organizations for officers, and civilian politicomilitary counterparts, expected to go into senior roles; the typical attendee is a senior lieutenant colonel or equivalent
- Game theory : A field of mathematics commonly associated with economics that provides models for behavior in many diverse situations, and is used in many academic fields from politics to computer science.
- Interoperability : Add brief definition or description
- Just war theory : The branch of ethics concerned with the basis for starting, conducting, and terminating wars
- Police : Organized government officials responsible for enforcing the criminal law of their locality, responding to designated emergencies, and various duties considered appropriate by their culture and government