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The Pentagon, headquarters of the United States Department of Defense.. The United States Department of Defense (DoD) has a complex organizational structure.It includes the Army, Navy, the Marine Corps, Air Force, Space Force, the Unified combatant commands, U.S. elements of multinational commands (such as NATO and NORAD), as well as non-combat agencies such as the Defense Intelligence Agency ...
Central Security Service. v. t. e. The United States Army ( USA) is the land service branch of the United States Armed Forces. It is one of the eight U.S. uniformed services, and is designated as the Army of the United States in the U.S. Constitution. [14] The Army is the oldest branch of the U.S. military and the most senior in order of ...
The United States Space Force (USSF) is the United States Armed Forces' space force and is the newest military branch. Originally established in 2019, it traces its history through Air Force Space Command and the Western Development Division to 1954. The United States Space Force is the principal space service, responsible for space warfare ...
Military branch. A United States Armed Forces Joint-Service Color Guard. This color guard consists of personnel from 5 of the 6 military branches of the United States Armed Forces ( Army, Marines, Air Force, Navy, and Coast Guard ). Military branch (also service branch or armed service) is according to common standard a subdivision of the ...
A navy, naval force, military maritime fleet, war navy, or maritime force is the branch of a nation's armed forces principally designated for naval and amphibious warfare; namely, lake -borne, riverine, littoral, or ocean -borne combat operations and related functions.
Military ranks are a system of hierarchical relationships, within armed forces, [1] police, [2] intelligence agencies or other institutions organized along military lines. The military rank system defines dominance, authority, and responsibility in a military hierarchy. It incorporates the principles of exercising power and authority into the ...
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. In larger armed forces, the cultures between the different branches of the armed forces can be quite ...
The reserve components of the United States Armed Forces are military organizations whose members generally perform a minimum of 39 days of military duty per year and who augment the active duty (or full-time) military when necessary. The reserve components are also referred to collectively as the National Guard and Reserve.