A commander-in-chief or supreme commander is the person who exercises supreme command and control over an armed force or a military branch. As a technical term, it refers to military competencies that reside in a country's executive leadership, a head of state, head of government, or other designated government official.
The formal role and title of a ruler commanding the armed forces derives from Imperator of the Roman Kingdom, Roman Republic and Roman Empire, who possessed imperium (command and other regal) powers.
In English use, the term was first used during the English Civil War. A nation's head of state (monarchical or republican) usually holds the position of commander-in-chief, even if effective executive power is held by a separate head of government. In a parliamentary system, the executive branch is ultimately dependent upon the will of the legislature; although the legislature does not issue orders directly to the armed forces and therefore does not control the military in any operational sense. Governors-general and colonial governors are also often appointed commander-in-chief of the military forces within their territory.
A commander-in-chief is sometimes referred to as supreme commander, which is sometimes used as a specific term. The term is also used for military officers who hold such power and authority, not always through dictatorship, and as a subordinate (usually) to a head of state (see Generalissimo). The term is also used for officers who hold authority over an individual military branch, special branch or within a theatre of operations.
This includes heads of states who:
Are chief executives with the political mandate to undertake discretionary decision-making, including command of the armed forces.
Mostly ceremonial heads of state (constitutional monarchs, viceroys and presidents in parliamentary republics) with residual substantive reserve powers over the armed forces, acting under normal circumstances on the constitutional advice of chief executives with the political mandate to undertake discretionary decision-making.
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Field marshal (or field-marshal, abbreviated as FM) is the most senior military rank, ordinarily senior to the general officer ranks. Usually, it is the highest rank in an army, and as such, few persons are appointed to it. It is considered as a five-star rank (OF-10) in modern-day armed forces in many countries. Promotion to the rank of field marshal in many countries historically required extraordinary military achievement by a general (a wartime victory).
The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America and consisting of 50 states, a federal district, five major unincorporated territories, nine Minor Outlying Islands, and 326 Indian reservations. It is the world's third-largest country by both land and total area. It shares land borders with Canada to its north and with Mexico to its south and has maritime borders with the Bahamas, Cuba, Russia, and other nations.
Admiral is one of the highest ranks in some navies. In the Commonwealth nations and the United States, a "full" admiral is equivalent to a "full" general in the army or the air force, and is above vice admiral and below admiral of the fleet, or fleet admiral. The word admiral in Middle English comes from Anglo-French amiral, "commander", from Medieval Latin admiralis, admirallus. These evolved from the Arabic amīral (أمير الـ) – amīr (أمير), "commander, prince, nobleman, lord or person who commands or rules over a number of people," and al (الـ), the Arabic article answering to "the.