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Military occupation is effective provisional control by a certain ruling power over a territory which is not under the formal sovereignty of that entity, without the volition of the actual sovereign. Military occupation is distinguished from annexation by its intended temporary nature (i.e. no claim for permanent sovereignty), by its military nature, and by citizenship rights of the controlling power not being conferred upon the subjugated population.
Military government may be broadly characterized as the administration or supervision of occupied territory, or as the governmental form of such an administration. Military government is distinguished from martial law, which is the temporary rule by domestic armed forces over disturbed areas.
The rules of military government are delineated in various international agreements, primarily the Hague Convention of 1907, the Geneva Conventions of 1949, as well as established state practice. The relevant international conventions, the International Committee of the Red Cross (ICRC) Commentaries, and other treaties by military scholars provide guidelines on such topics as rights and duties of the occupying power, protection of civilians, treatment of prisoners of war, coordination of relief efforts, issuance of travel documents, property rights of the populace, handling of cultural and art objects, management of refugees, and other concerns which are very important both before and after the cessation of hostilities. A country that establishes a military government and violates internationally agreed upon norms runs the risk of censure, criticism, or condemnation. In the current era, the practices of military government have largely become a part of customary international law, and form a part of the laws of war.
Article 42 of the 1907 Hague Convention on Land Warfare specify that "[t]erritory is considered occupied when it is actually placed under the authority of the hostile army." The form of administration by which an occupying power exercises government authority over occupied territory is called "military government." Neither the Hague Conventions nor the Geneva Conventions specifically define or distinguish an act of "invasion". The terminology of "occupation" is used exclusively.
From the second half of the 18th century onwards, international law has come to distinguish between the military occupation of a country and territorial acquisition by invasion and annexation, the difference between the two being originally expounded upon by Emerich de Vattel in The Law of Nations (1758). The clear distinction has been recognized among the principles of international law since the end of the Napoleonic wars in the 19th century. These customary laws of belligerent occupation which evolved as part of the laws of war gave some protection to the population under the military occupation of a belligerent power.
The Hague Convention of 1907 further clarified and supplemented these customary laws, specifically within "Laws and Customs of War on Land" (Hague IV); October 18, 1907: "Section III Military Authority over the territory of the hostile State." The first two articles of that section state:
In 1949 these laws governing belligerent occupation of an enemy state's territory were further extended by the adoption of the Fourth Geneva Convention (GCIV). Much of GCIV is relevant to protected persons in occupied territories and Section III: Occupied territories is a specific section covering the issue.
Article 6 restricts the length of time that most of GCIV applies:
GCIV emphasised an important change in international law. The United Nations Charter (June 26, 1945) had prohibited war of aggression (See articles 1.1, 2.3, 2.4) and GCIV Article 47, the first paragraph in Section III: Occupied territories, restricted the territorial gains which could be made through war by stating:
Article 49 prohibits the forced mass movement of people out of or into occupied state's territory:
Protocol I (1977): "Protocol Additional to the Geneva Conventions of 12 August 1949, and relating to the Protection of Victims of International Armed Conflicts" has additional articles which cover military occupation but many countries including the U.S. are not signatory to this additional protocol.
In the situation of a territorial cession as the result of war, the specification of a "receiving country" in the peace treaty merely means that the country in question is authorized by the international community to establish civil government in the territory. The military government of the principal occupying power will continue past the point in time when the peace treaty comes into force, until it is legally supplanted.
"Military government continues until legally supplanted" is the rule, as stated in Military Government and Martial Law, by William E. Birkhimer, 3rd edition 1914.
There does not have to be a formal announcement of the beginning of "military government," nor is there any requirement of a specific number of people to be in place, or "on site" before military government can be said to have commenced.
See Birkhimer, p. 25–26:
No proclamation of part of the victorious commander is necessary to the lawful inauguration and enforcement of military government. That government results from the fact that the former sovereignty is ousted, and the opposing army now has control. Yet the issuing such proclamation is useful as publishing to all living in the district occupied those rules of conduct which will govern the conqueror in the exercise of his authority. Wellington, indeed, as previously mentioned, said that the commander is bound to lay down distinctly the rules according to which his will is to be carried out. But the laws of war do not imperatively require this, and in very many instances it is not done. When it is not, the mere fact that the country is militarily occupied by the enemy is deemed sufficient notification to all concerned that the regular has been supplanted by a military government.
The terminology of "the occupying power" as spoken of in the laws of war is most properly rendered as "the principal occupying power," or alternatively as "the occupying power." This is because the law of agency is always available (When the administrative authority for the military occupation of particular areas is delegated to other troops, a "principal -- agent" relationship is in effect).
Because the law of agency is a very general pattern, primarily appliable in this case as the means of regulating the relationships between the said "powers", but a question however in which considerations of logistics are sometimes to be taken in consideration, that definition is not always appliable outside of those contexts which can be analysed by analogy as related to warlording, even though it does relate more generally to all possible types of military coalitions.
In most contexts determined by the application of the defined and modern laws of war, delegation to agencies generally tends to relating to civilian organizations. Juridical considerations like the above remain in the other cases merely consensual between the said powers. For example, in 1948 the U.S. Military Tribunal in Nuremberg states:
In belligerent occupation the occupying power does not hold enemy territory by virtue of any legal right. On the contrary, it merely exercises a precarious and temporary actual control. This can be seen from Article 42 of the Hague Regulations which grants certain well limited rights to a military occupant only in enemy territory which is 'actually placed' under his control.
The conqueror is the principal occupying power.
The examples and perspective in this section deal primarily with the United States and do not represent a worldwide view of the subject. (August 2015) (Learn how and when to remove this template message)
Rule: Military occupation continues until legally supplanted. According to Eyal Benvenisti, military occupation can end in a number of ways, such as: "loss of effective control, namely when the occupant is no longer capable of exercising its authority; through the genuine consent of the sovereign (the ousted government or an indigenous one) by the signing of a peace agreement; or by transferring authority to an indigenous government endorsed by the occupied population through referendum and which has received international recognition."
This is explained as follows. For the situation where no territorial cession is involved, the military government of the principal occupying power will end with the coming into force of the peace settlement.
In the situation of a territorial cession, there must be a formal peace treaty. However, the military government of the principal occupying power does not end with the coming into force of the peace treaty.
Hence, at the most basic level, the terminology of "legally supplanted" is interpreted to mean "legally supplanted by a civil government fully recognized by the national (or "federal") government of the principal occupying power."
In most wars some territory is placed under the authority of the hostile army. Most military occupations end with the cessation of hostilities. In some cases the occupied territory is returned and in others the land remains under the control of the occupying power but usually not as militarily occupied territory. Sometimes the status of presences is disputed by a party to the situation.
Military occupation is usually a temporary phase, preceding either the handing back of the territory, or its annexation. The world's longest ongoing military occupation, and the longest in modern times by one single occupying power, is Israel’s occupation of the West Bank and East Jerusalem (1967–present). 
The War Report: Armed Conflict in 2014 (2015) reports (p. 24), "Other belligerent occupations that have been alleged include the occupation by the United Kingdom of the Falkland Islands/Malvinas (Argentina claims this as sovereign territory), of Tibet by China, and of the State of Hawaii by the United States. The War Report makes no determination as to whether belligerent occupation is occurring in these cases."
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The difference between effective military occupation (or conquest) and annexation involves a profound difference in the rights conferred by each
The significance of the temporary nature of military occupation is that it brings about no change of allegiance. Military government remains an alien government whether of short or long duration, though prolonged occupation may encourage the occupying power to change military occupation into something else, namely annexation
The conditions that define when occupation begins also identify when it ends. Obviously, occupation can end in a number of ways: with the loss of effective control, namely when the occupant is no longer capable of exercising its authority; through the genuine consent of the sovereign (the ousted government or an indigenous one) by the signing of a peace agreement; or by transferring authority to an indigenous government endorsed by the occupied population through referendum and which has received international recognition.
The Israeli occupation of the West Bank and Gaza is the longest military occupation in modern times.
...longest official military occupation of modern history—currently entering its thirty-fifth year
...longest-lasting military occupation of the modern age
This is probably the longest occupation in modern international relations, and it holds a central place in all literature on the law of belligerent occupation since the early 1970s
These are settlements and a military occupation that is the longest in the twentieth and twenty-first century, the longest formerly being the Japanese occupation of Korea from 1910 to 1945. So this is thirty-three years old, pushing the record.
Israel is the only modern state that has held territories under military occupation for over four decades
Although the basic philosophy behind the law of military occupation is that it is a temporary situation modem occupations have well demonstrated that rien ne dure comme le provisoire A significant number of post-1945 occupations have lasted more than two decades such as the occupations of Namibia by South Africa and of East Timor by Indonesia as well as the ongoing occupations of Northern Cyprus by Turkey and of Western Sahara by Morocco. The Israeli occupation of the Palestinian territories, which is the longest in all occupation's history has already entered its fifth decade.
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