Military police in the context of "Less-lethal weapons"

A gendarmerie (/ʒɒnˈdɑːrməri, ʒɒ̃-/) is a military or paramilitary force with law enforcement duties among the civilian population. The term gendarme (English: /ˈʒɒndɑːrm/) is derived from the medieval French expression gens d'armes, which translates to 'men-at-arms' (lit. 'people of arms'). In France and some Francophone nations, the gendarmerie is a branch of the armed forces that is responsible for internal security in parts of the territory (primarily in rural areas and small towns in the case of France), with additional duties as military police for the armed forces. It was introduced to several other Western European countries during the Napoleonic conquests. In the mid-twentieth century, a number of former French mandates and colonial possessions (such as Lebanon, Syria, the Ivory Coast and the Republic of the Congo) adopted a gendarmerie after independence.

Similar forces exist in most European countries. The European Gendarmerie Force is a structure, aligned with the European Union, that facilitates joint operations. A similar concept to gendarmerie exists in Russia in the form of internal troops, which are present in many CIS states.

The Imperial Japanese Navy land forces (大日本帝國海軍陸戦隊, Dai-Nippon Teikoku Kaigun Rikusentai) were a variety of land-based units of the Imperial Japanese Navy (IJN) organized for offensive operations, the defense of Japanese naval and shore-based facilities, military policing tasks, construction and engineering, training, and shore-based anti-aircraft roles; both overseas, and in the Japanese home islands. Units ranged from dedicated military police formations, to ad-hoc groups of naval personnel pressed into service as naval infantry, to professional marines, among others. The land forces were most active during the interwar period and World War II, with IJN land forces complementing, supporting, and in some cases, operating in-place of Imperial Japanese Army units. Upon Imperial Japan’s surrender, IJN land forces were disbanded alongside the IJN proper in 1945.

In the United States Army, the term combat support refers to units that provide fire support and operational assistance to combat elements. Combat support units provide specialized support functions to combat units in the following areas:

• Chemical Warfare
• Combat Engineering
• Military Intelligence
• Security
• Communications

Combat support should not be confused with combat service support. Combat Support units are focused on providing operational support to combat units, while Combat Service Support units are focused on providing logistical support to combat units. Actual combat units are collectively referred to as combat arms units; hence, all army units fall into the category of either combat arms, combat support, or combat service support.

The Carabinieri are the national gendarmerie of Italy who primarily carry out domestic and foreign policing duties. It is one of Italy's main law enforcement agencies, alongside the Polizia di Stato and the Guardia di Finanza. As with the Guardia di Finanza but in contrast to the Polizia di Stato, the Carabinieri are a military force. As the fourth branch of the Italian Armed Forces, they come under the authority of the Ministry of Defence; for activities related to inland public order and security, they functionally depend on the Ministry of the Interior. In practice, there is a significant overlap between the jurisdiction of the Polizia di Stato and Carabinieri, and both of them are contactable through 112, the European Union's Single Emergency number. Unlike the Polizia di Stato, the Carabinieri have responsibility for policing the military, and a number of members regularly participate in military missions abroad.

They were originally founded as the police force of the Kingdom of Sardinia, the forerunner of the Kingdom of Italy. During the process of Italian unification, the Carabinieri were appointed as the "First Force" of the new national military organization. Although the Carabinieri assisted in the suppression of opposition during the rule of Benito Mussolini, they were also responsible for his downfall and many units were disbanded during World War II by Nazi Germany, which resulted in large numbers of Carabinieri joining the Italian resistance movement.

A police dog, also known as a K-9 (phonemic abbreviation of canine), is a dog that is trained to assist police and other law enforcement officers. Their duties may include searching for drugs and explosives, locating missing people, finding crime scene evidence, protecting officers and other people, and attacking suspects who flee from officers. The breeds most commonly used by law enforcement are the German Shepherd, Belgian Malinois, Bloodhound, Dutch Shepherd, and Labrador Retriever. In recent years, the Belgian Malinois has become the leading choice for police and military work due to their intense drive, focus, agility, and smaller size, though German Shepherds remain the breed most associated with law enforcement.

Police dogs are used on a federal and local level for law enforcement purposes in many parts of the world. They are often assigned to what in somenations is referred to as a K-9 Unit, with a specific handler, and must remember several verbal cues and hand gestures. Initial training for a police dog typically takes between eight months and a year, depending on where and how they are trained, and for what purpose. Police dogs often regularly take training programs with their assigned handler to reinforce their training. In many countries, intentionally injuring or killing a police dog is a criminal offense.

A penal military unit, also known as a penal formation, disciplinary unit, or just penal unit (usually named for their formation and size, such as penal battalion for battalions, penal regiment for regiments, penal company for companies, etc.), is a military formation consisting of convicts mobilized for military service. Such formations may consist of military prisoners convicted under military law, civilian prisoners convicted in civilian courts, prisoners of war who have chosen to side with their captors, or a combination of these groups.

Service in penal military units is generally considered a form of punishment, discipline, or penal labour, used in lieu of, or offered as an alternative to, imprisonment or capital punishment. Penal units have historically been used as disposable cannon fodder, treated poorly or with little regard and used in compromising or dangerous situations (commonly suicide missions such as demining or forlorn hope advance parties), as march battalions that maintain replacement personnel as reserves, or kept in the rear for military operations other than war or menial labour relating to the war effort, guarded and overseen by regular military units, military police, or barrier troops to ensure they do not attempt to escape, retreat, or mutiny. However, this is not always the case: some penal units are treated the same as regular units and, depending on military organization, a dedicated penal unit may not exist at all, with convicts instead being placed in a regular unit. Rewards and incentives for convicts to serve in a penal unit vary—often expungement, commutation, stay of execution, or a pardon—though penal units used as punishment typically lack those by nature.

A military prison is a prison operated by a military. Military prisons are used variously to house prisoners of war, unlawful combatants, those whose freedom is deemed a national security risk by the military or national authorities, and members of the military found guilty of military offenses. There are two types: penal and confinement-oriented, where captured enemy combatants are confined for military reasons until hostilities cease. Most militaries have some sort of military police unit operating at the divisional level or below to perform many of the same functions as civilian police, from traffic-control to the arrest of violent offenders and the supervision of detainees and prisoners of war.

Barrier troops, blocking units, or anti-retreat forces are military units that are located in the rear or on the front line (behind the main forces) to maintain military discipline, prevent the flight of servicemen from the battlefield, capture spies, saboteurs and deserters, and return troops who flee from the battlefield or lag behind their units. Barrier troops differ from military police, as barrier troops exert their effect through physical presence near specific allied units, as a preventative measure against retreat and other actions, whereas military police apprehend and control those who have already done so, typically in a wider area.

The Tokkeitai (特警隊; short for 特別警察隊, Tokubetsu Keisatsutai, "Special Police Corps", or Naval Secret Police) was the Imperial Japanese Navy's military police, equivalent to the Imperial Japanese Army's Kempeitai.

The original Tokkeitai was known as the General Affairs Section and concerned itself with military police and personnel work within the Navy: personnel, discipline and records. It took a more active role, partly to keep the Kempeitai and the Army from meddling in Navy affairs.