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A military, also known collectively as armed forces, is a heavily Weapon, highly organized force primarily intended for warfare. Militaries are typically authorized and maintained by a sovereign state, with their members identifiable by a distinct military uniform. They may consist of one or more such as an army, navy, air force, space force, marines, or coast guard. The main task of a military is usually defined as defence of their state and its interests against external armed threats.
In broad usage, the terms "armed forces" and "military" are often synonymous, although in technical usage a distinction is sometimes made in which a country's armed forces may include other paramilitary forces such as armed police.
Beyond warfare, the military may be employed in additional sanctioned and non-sanctioned functions within the state, including internal security threats, crowd control, promotion of , emergency services and reconstruction, protecting corporate economic interests, social ceremonies, and national honour guards. (2025). 9781107134195, Cambridge University Press. ISBN 9781107134195
A nation's military may function as a discrete social subculture, with dedicated infrastructure such as military housing, Military academy, utilities, logistics, hospitals, legal services, food production, finance, and banking services.
The profession of is older than recorded history. Some images of classical antiquity portray the power and feats of military Leadership. The Battle of Kadesh in 1274 BC from the reign of Ramesses II, features in Relief monuments. The first Emperor of a unified China, Qin Shi Huang, created the Terracotta Army to represent his military might. Terra cotta of massed ranks of Qin Shi Huang's terra cotta soldiers The Ancient Rome wrote many and writings on warfare, as well as many decorated and .
As a noun phrase, "the military" usually refers generally to a country's armed forces, or sometimes, more specifically, to the senior officers who command them. In general, it refers to the physicality of armed forces, their personnel, equipment, and the physical area which they occupy.
As an adjective, military originally referred only to soldiers and soldiering, but it broadened to apply to land forces in general, and anything to do with their profession. The names of both the Royal Military Academy (1741) and United States Military Academy (1802) reflect this. However, at about the time of the Napoleonic Wars, military began to be used in reference to armed forces as a whole, such as "military service", "military intelligence", and "military history". As such, it now connotes any activity performed by armed force personnel.
Military history has a number of facets. One main facet is to learn from past accomplishments and mistakes, so as to more effectively wage war in the future. Another is to create a sense of military tradition, which is used to create cohesive military forces. Still, another is to learn to prevent wars more effectively. Human knowledge about the military is largely based on both recorded and oral tradition of military conflicts (war), their participating army and navy and, more recently, . (2025). 9780745633909, Polity Press. ISBN 9780745633909
In addition to their rank, personnel occupy one of many trade roles, which are often grouped according to the nature of the role's military tasks on combat operations: combat roles (e.g. infantry), combat support roles (e.g. ), and combat service support roles (e.g. logistical support).
Whereas recruits who join as officers tend to be Upwardly mobile, most enlisted personnel have a childhood background of relative socio-economic deprivation.Brett, Rachel, and Irma Specht. Young Soldiers: Why They Choose to Fight. Boulder: Lynne Rienner Publishers, 2004. For example, after the US suspended conscription in 1973, "the military disproportionately attracted African American men, men from lower-status socioeconomic backgrounds, men who had been in nonacademic high school programs, and men whose high school grades tended to be low". However, a study released in 2020 on the socio-economic backgrounds of U.S. Armed Forces personnel suggests that they are at parity or slightly higher than the civilian population with respect to socio-economic indicators such as parental income, parental wealth and cognitive abilities. The study found that technological, tactical, operational and doctrinal changes have led to a change in the demand for personnel. Furthermore, the study suggests that the most disadvantaged socio-economic groups are less likely to meet the requirements of the modern U.S. military.
Military Law introduces offences not recognized by civilian courts, such as Desertion, desertion, political acts, malingering, behaving disrespectfully, and disobedience (see, for example, offences against military law in the United Kingdom). Penalties range from a summary reprimand to imprisonment for several years following a Court-martial. Certain rights are also restricted or suspended, including the freedom of association (e.g. union organizing) and freedom of speech (speaking to the media). Military personnel in some countries have a right of conscientious objection if they believe an order is immoral or unlawful, or cannot in good conscience carry it out.
Personnel may be posted to bases in their home country or overseas, according to operational need, and may be deployed from those bases on exercises or operations. During peacetime, when military personnel are generally stationed in or other permanent military facilities, they conduct administrative tasks, training and education activities, technology maintenance, and recruitment.
The difficulty in using military intelligence concepts and military intelligence methods is in the nature of the secrecy of the information they seek, and the clandestine nature that intelligence operatives work in obtaining what may be plans for a conflict escalation, initiation of combat, or an invasion.
An important part of the military intelligence role is the military analysis performed to assess military capability of potential future aggressors, and provide combat modelling that helps to understand factors on which comparison of forces can be made. This helps to quantify and qualify such statements as: "China and India maintain the largest armed forces in the World" or that "the U.S. Military is considered to be the world's strongest". Statistics on Americans' opinion about the U.S. being the world's no1 military power , Gallup, March 2012. Retrieved May 3, 2013.
Although some groups engaged in combat, such as militants or resistance movements, refer to themselves using military terminology, notably 'Army' or 'Front', none have had the structure of a national military to justify the reference, and usually have had to rely on support of outside national militaries. They also use these terms to conceal from the MI their true capabilities, and to impress potential ideological recruits.
Having military intelligence representatives participate in the execution of the national defence policy is important, because it becomes the first respondent and commentator on the policy expected strategic goal, compared to the realities of identified threats. When the intelligence reporting is compared to the policy, it becomes possible for the national leadership to consider allocating resources over and above the officers and their subordinates military pay, and the expense of maintaining military facilities and military support services for them.
The process of allocating resources is conducted by determining a military budget, which is administered by a military finance organization within the military. Military procurement is then authorized to purchase or contract provision of goods and services to the military, whether in peacetime at a permanent base, or in a combat zone from local population.
Development of military doctrine is perhaps the most important of all capability development activities, because it determines how military forces are used in conflicts, the concepts and methods used by the command to employ appropriately military skilled, soldier and equipped personnel in achievement of the tangible goals and objectives of the war, campaign, battle, engagement, and action.Dupuy, T.N. (1990) Understanding war: History and Theory of combat, Leo Cooper, London, p. 67 The line between strategy and tactics is not easily blurred, although deciding which is being discussed had sometimes been a matter of personal judgement by some commentators, and military historians. The use of forces at the level of organization between strategic and tactical is called operational mobility.
Although concerned with research into military psychology, particularly combat stress and how it affects troop morale, often the bulk of military science activities is directed at military intelligence technology, military communications, and improving military capability through research. The design, development, and prototyping of , military support equipment, and military technology in general, is also an area in which much effort is invested – it includes everything from global communication networks and to paint and food.
Although mostly concerned with the military transport, as a means of delivery using different modes of transport; from , to operating from permanent military base, it also involves creating field supply dumps at the rear of the combat zone, and even forward supply points in a specific unit's tactical area of responsibility.
These supply points are also used to provide military engineering services, such as the recovery of defective and derelict vehicles and weapons, maintenance of weapons in the field, the repair and field modification of weapons and equipment; and in peacetime, the life-extension programmes undertaken to allow continued use of equipment. One of the most important role of logistics is the supply of as a primary type of consumable, their storage, and disposal.
The operational level is at a scale bigger than one where line of sight and the time of day are important, and smaller than the strategic level, where production and politics are considerations. Formations are of the operational level if they are able to conduct operations on their own, and are of sufficient size to be directly handled or have a significant impact at the strategic level. This concept was pioneered by the Germany army prior to and during the Second World War. At this level, planning and duration of activities takes from one week to a month, and are executed by Field Army and Army Corps and their naval and air equivalents.
One of the oldest military publications is The Art of War, by the Chinese philosopher Sun Tzu. Written in the 6th century BCE, the 13-chapter book is intended as military instruction, and not as military theory, but has had a huge influence on Asian military doctrine, and from the late 19th century, on European and United States . It has even been used to formulate business tactics, and can even be applied in social and political areas.
The Classical Greeks and the Romans wrote prolifically on military campaigning. Among the best-known Roman works are Julius Caesar's commentaries on the Gallic Wars, and the Roman Civil war – written about 50 BC.
Two major works on tactics come from the late Roman period: Taktike Theoria by Aelianus Tacticus, and De Re Militari ('On military matters') by Vegetius. Taktike Theoria examined Greek military tactics, and was most influential in the Byzantine world and during the Golden Age of Islam.
De Re Militari formed the basis of European military tactics until the late 17th century. Perhaps its most enduring maxim is Igitur qui desiderat pacem, praeparet bellum (let he who desires peace prepare for war).
Due to the changing nature of combat with the introduction of artillery in the European Middle Ages, and infantry firearms in the Renaissance, attempts were made to define and identify those strategies, grand tactics, and tactics that would produce a victory more often than that achieved by the Romans in praying to the gods before the battle.
Later this became known as military science, and later still, would adopt the scientific method approach to the conduct of military operations under the influence of the Industrial Revolution thinking. In his seminal book On War, the Major-General and leading expert on modern military strategy, Carl von Clausewitz defined military strategy as 'the employment of battles to gain the end of war'. According to Clausewitz:
strategy forms the plan of the War, and to this end it links together the series of acts which are to lead to the final decision, that is to say, it makes the plans for the separate campaigns and regulates the combats to be fought in each.Hence, Clausewitz placed political aims above military goals, ensuring civilian control of the military. Military strategy was one of a triumvirate of 'arts' or 'sciences' that governed the conduct of warfare, the others being: military tactics, the execution of plans and manoeuvring of forces in battle, and maintenance of an army. The meaning of military tactics has changed over time; from the deployment and manoeuvring of entire land armies on the fields of ancient battles, and galley fleets; to modern use of small unit , , bombardment attacks, , , hit-and-run tactics used mainly by guerrilla forces, and, in some cases, on land and at sea. Evolution of aerial warfare introduced its own air combat tactics. Often, military deception, in the form of military camouflage or misdirection using , is used to confuse the enemy as a tactic.
A major development in infantry tactics came with the increased use of trench warfare in the 19th and 20th centuries. This was mainly employed in World War I in the Gallipoli campaign, and the Western Front. Trench warfare often turned to a stalemate, only broken by a large loss of life, because, in order to attack an enemy entrenchment, soldiers had to run through an exposed 'no man's land' under heavy fire from their opposing entrenched enemy.
On Land warfare, the first significant technological advance in warfare was the development of ranged weapons, notably the sling and later the bow and arrow. The next significant advance came with the domestication of the horses and mastering of equestrianism, creating cavalry and allowing for faster military advances and better logistics. Possibly the most significant advancement was the wheel, a staple of transportation, starting with the chariot and eventually . The bow was manufactured in increasingly larger and more powerful versions to increase both the weapon range and armour penetration performance, developing into , , , and . These proved particularly useful during the rise of cavalry, as horsemen encased in ever-more sophisticated armour came to dominate the battlefield.
In medieval China, gunpowder had been invented, and was increasingly used by the military in combat. The use of gunpowder in the early vase-like mortars in Europe, and advanced versions of the longbow and crossbow with armour-piercing , put an end to the dominance of the armoured knight. Gunpowder resulted in the development and fielding of the musket, which could be used effectively with little training. In time, the successors to muskets and , in the form of and artillery, would become core battlefield technology.]]As the speed of technological advances accelerated in civilian applications, so too did military and warfare become industrialized. The newly invented machine gun and repeating rifle redefined firepower on the battlefield, and, in part, explains the high casualty rates of the American Civil War and the decline of melee combat in warfare. The next breakthrough was the conversion of artillery parks from the Muzzleloader, to quicker Breechloader with recoiling barrels that allowed quicker aimed fire and use of a shield. The widespread introduction of low smoke (smokeless) propellant powders since the 1880s also allowed for a great improvement of artillery ranges. The development of breech loading had the greatest effect on naval warfare for the first time since the Middle Ages, altering the way weapons are mounted on . Naval tactics were divorced from the reliance on sails with the invention of the internal combustion. A further advance in military naval technology was the submarine and the torpedo. Sparrow medium range air-to-air missile from an F-15 Eagle]]During World War I, the need to break the deadlock of trench warfare saw the rapid development of many new technologies, particularly . Military aviation was extensively used, and became decisive in many battles of World War II, which marked the most frantic period of weapons development in history. Many new designs, and concepts were used in combat, and all existing technologies of warfare were improved between 1939 and 1945. During World War II, significant advances were made in military communications through increased use of radio, military intelligence through use of the radar, and in military medicine through use of penicillin, while in the air, the guided missile, jet aircraft, and were seen for the first time. Perhaps the most infamous of all military technologies was the creation of , although the exact effects of its radiation were unknown until the early 1950s. Far greater use of had finally eliminated the cavalry from the military force structure. After World War II, with the onset of the Cold War, the constant technological development of new weapons was institutionalized, as participants engaged in a constant arms race in capability development. This constant state of weapons development continues into the present. Main battle tanks, and other heavy equipment such as armoured fighting vehicles, military aircraft, and , are characteristic to organized military forces. The most significant technological developments that influenced combat have been guided missiles, which can be used by all branches of the armed services. More recently, information technology, and its use in surveillance, including space-based reconnaissance systems, have played an increasing role in military operations. The impact of information warfare, which focuses on attacking command communication systems, and military databases, has been coupled with the use of robotic systems in combat, such as unmanned combat aerial vehicles and unmanned ground vehicles.
Recently, there has also been a particular focus towards the use of renewable fuels for running military vehicles on. Unlike fossil fuels, renewable fuels can be produced in any country, creating a strategic advantage. The U.S. military has committed itself to have 50% of its energy consumption come from alternative sources.
The relationship between the military and the society it serves is a complicated and ever-evolving one. Much depends on the nature of the society itself, and whether it sees the military as important, as for example in time of threat or war, or a burdensome expense typified by defence cuts in time of peace.
One difficult matter in the relation between military and society is control and transparency. In some countries, limited information on military operations and budgeting is accessible for the public. However, transparency in the military sector is crucial to fight corruption. This showed the Government Defence Anti-corruption Index Transparency International UK published in 2013.
Militaries often function as society within societies, by having their own military communities, economies, education, medicine, and other aspects of a functioning civil society. A military is not limited to nations in of itself, as many private military companies (or PMCs) can be used or hired by organizations and figures as security, escort, or other means of protection where police, agencies, or militaries are absent or not trusted.
Either because of the cultural memory, national history, or the potentiality of a military threat, the militarist argument asserts that a civilian population is dependent upon, and thereby subservient to the needs and goals of its military for continued independence. Militarism is sometimes contrasted with the concepts of comprehensive national power, soft power and hard power.
Most nations have separate which regulate conduct in war and during peacetime. An early exponent was Hugo Grotius, whose On the Law of War and Peace (1625) had a major impact of the humanitarian approach to warfare development. 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.
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