Question: Humanitarian protections in war are denied to certain combatants under what treaty?

Context articles: Fourth Geneva Convention
Treaty Three Police Service
Hors de combat
International humanitarian law
Common Peace
Perfidy
Combatant
Third Geneva Convention
Interstellar war
Geneva Conventions

The Geneva Convention relative to the Protection of Civilian Persons in Time of War, commonly referred to as the Fourth Geneva Convention and abbreviated as GCIV, is one of the four treaties of the Geneva Conventions.
 It was adopted in August 1949.
 While the first three conventions dealt with combatants, the Fourth Geneva Convention was the first to deal with humanitarian protections for civilians in a war zone.
 There are currently 196 countries party to the 1949 Geneva Conventions, including this and the other three treaties.
The Treaty Three Police Service (T3PS) in Ontario began as the Treaty #3 Policing Initiative in August 1999 as directed by the Executive Council of Grand Council of Treaty 3.
 It officially began operation on August 5, 2003, and became Canada’s newest First Nation self-administered police service.
 Members of Treaty Three Police are appointed as First Nations Constables by the Commissioner of the OPP pursuant to s.54 of the Police Services Act.
 They have the powers of a police officer for the purpose of carrying out duties specified in their appointments and under federal law have the powers and protections of peace officers.
 Because First Nations Constables are not police officers as defined by the Police Services Act, their status in law is different but equal to that of a police officer.
 The jurisdiction of the Treaty Three Police Service includes all signatory Treaty Three First Nations (The Paypom Treaty) previously policed by the OPP administered First Nations Policing Program.
 The OPP are mandated to provide policing on a reserve, village or any other area not currently under a policing agreement.
 All operations save major crimes are investigated by Treaty Three First Nations Constable patrol officers and/or the T3PS Crime Unit.
 The Service exists with the unanimous agreement of the signatory Band Councils or Band Chiefs.
 Unlike police forces in cities and towns, the Treaty Three Police Service is not required to provide all the regular services of a police force but does provide virtually everything needed (or requests additional OPP resources, e.g. K9 Unit).
Hors de combat, literally meaning "outside the fight", is a French term used in diplomacy and international law to refer to persons who are incapable of performing their ability to wage war.
 Examples include fighter pilots or aircrews parachuting from their disabled aircraft, as well as the sick, wounded, detained, or otherwise disabled.
 Persons "hors de combat" are normally granted special protections according to the laws of war, sometimes including prisoner-of-war status, and therefore officially become non-combatants. Under the 1949 Geneva Conventions, unlawful combatants "hors de combat" are granted the same privilege and to be treated with humanity while in captivity but unlike lawful combatants, they are subject to trial and punishment, which includes capital punishment.
International humanitarian law (IHL) is the law that regulates the conduct of war ("jus in bello").
 It is that branch of international law which seeks to limit the effects of armed conflict by protecting persons who are not participating in hostilities, and by restricting and regulating the means and methods of warfare available to combatants. IHL is inspired by considerations of humanity and the mitigation of human suffering.
 "It comprises a set of rules, established by treaty or custom, that seeks to protect persons and property/objects that are (or may be) affected by armed conflict and limits the rights of parties to a conflict to use methods and means of warfare of their choice".
 It includes "the Geneva Conventions and the Hague Conventions, as well as subsequent treaties, case law, and customary international law".
 It defines the conduct and responsibilities of belligerent nations, neutral nations, and individuals engaged in warfare, in relation to each other and to "protected persons", usually meaning non-combatants.
 It is designed to balance humanitarian concerns and military necessity, and subjects warfare to the rule of law by limiting its destructive effect and mitigating human suffering.
Common Peace (Κοινὴ Εἰρήνη, "Koinē Eirēnē") was the term used in ancient Greece for a peace treaty that simultaneously declared peace between all the combatants in a war.
 The concept was invented with the Peace of Antalcidas in 387 BC.
 Prior to that time, peace treaties in Greece were between two combatants or alliances only and had an expiration date after which either side was free to resume hostilities.
 According to John Fine, before the advent of the concept of Common Peace, "since peace was seemingly considered only a lull in the more normal condition of war, treaties were always bilateral and usually limited to specified periods of time."
 An example of such a limited peace is the Thirty Years Peace that concluded the so-called First Peloponnesian War.
In the context of war, perfidy is a form of deception in which one side promises to act in good faith (such as by raising a flag of truce) with the intention of breaking that promise once the unsuspecting enemy is exposed (such as by coming out of cover to attack the enemy coming to take the "surrendering" prisoners into custody).
 Perfidy constitutes a breach of the laws of war and so is a war crime, as it degrades the protections and mutual restraints developed in the interest of all parties, combatants, and civilians.
A combatant is a person who takes a direct part in the hostilities of an armed conflict.
 If a combatant follows the law of war, then he or she is considered a privileged combatant and upon capture, he or she will qualify as a prisoner of war under the Third Geneva Convention (GCIII).
 An unprivileged combatant is a person, such as a mercenary, who takes a direct part in the hostilities but who upon capture does not qualify for prisoner-of-war status.
The Third Geneva Convention, relative to the treatment of prisoners of war, is one of the four treaties of the Geneva Conventions.
 The Geneva Convention relative to the Treatment of Prisoners of War was first adopted in 1929, but significantly revised at the 1949 conference.
 It defines humanitarian protections for prisoners of war.
 There are 196 state parties to the Convention.
An interstellar war involves a warfare between combatants from different planetary systems.
 The concept provides a common plot device in science fiction, especially in the space opera subgenre.
 In contrast, the term "intergalactic war" refers to war between combatants from different galaxies; "interplanetary war" refers to war between combatants from different planets of the same solar system.
The Geneva Conventions comprise four treaties, and three additional protocols, that establish the standards of international law for humanitarian treatment in war.
 The singular term "Geneva Convention" usually denotes the agreements of 1949, negotiated in the aftermath of the Second World War (1939–45), which updated the terms of the two 1929 treaties, and added two new conventions.
 The Geneva Conventions extensively defined the basic rights of wartime prisoners (civilians and military personnel); established protections for the wounded and sick; and established protections for the civilians in and around a war-zone.
 The treaties of 1949 were ratified, in whole or with reservations, by 196 countries.
 Moreover, the Geneva Convention also defines the rights and protections afforded to non-combatants, yet, because the Geneva Conventions are about people in war, the articles do not address warfare proper—the use of weapons of war—which is the subject of the Hague Conventions (First Hague Conference, 1899; Second Hague Conference 1907), and the bio-chemical warfare Geneva Protocol (Protocol for the Prohibition of the Use in War of Asphyxiating, Poisonous or other Gasses, and of Bacteriological Methods of Warfare, 1925).