For the purposes of this article the term “unlawful/unprivileged combatant/belligerent” is understood as describing all persons taking a direct part in hostilities without being entitled to do so and who therefore cannot be classified as prisoners of war on falling into the power of the enemy. This seems to be the most commonly shared understanding. It would include for example civilians taking a direct part in hostilities, as well as members of militias and of other volunteer corps — including those of organized resistance movements — not being integrated in the regular armed forces but belonging to a party to conflict, provided that they do not comply with the conditions of Article 4A (2) of GC III.(emphasis added)
Art 4. A. Prisoners of war, in the sense of the present Convention, are persons belonging to one of the following categories, who have fallen into the power of the enemy:note that the above definition of combatants who are entitled to "lawful combatant" status includes "supply contractors" Article 4A(4). but from the context, it seems to me that it is referring to unarmed people since all of the others who are in the Art 4A(4) group would generally be unarmed people. (besides, the definition of "unlawful combatant specifically references "Article 4A (2)", not Article 4A(4).
(1) Members of the armed forces of a Party to the conflict, as well as members of militias or volunteer corps forming part of such armed forces.
(2) Members of other militias and members of other volunteer corps, including those of organized resistance movements, belonging to a Party to the conflict and operating in or outside their own territory, even if this territory is occupied, provided that such militias or volunteer corps, including such organized resistance movements, fulfil the following conditions:[
(a) that of being commanded by a person responsible for his subordinates;
(b) that of having a fixed distinctive sign recognizable at a distance;
(c) that of carrying arms openly;
(d) that of conducting their operations in accordance with the laws and customs of war.
(3) Members of regular armed forces who profess allegiance to a government or an authority not recognized by the Detaining Power.
(4) Persons who accompany the armed forces without actually being members thereof, such as civilian members of military aircraft crews, war correspondents, supply contractors, members of labour units or of services responsible for the welfare of the armed forces, provided that they have received authorization, from the armed forces which they accompany, who shall provide them for that purpose with an identity card similar to the annexed model.
(5) Members of crews, including masters, pilots and apprentices, of the merchant marine and the crews of civil aircraft of the Parties to the conflict, who do not benefit by more favourable treatment under any other provisions of international law.
(6) Inhabitants of a non-occupied territory, who on the approach of the enemy spontaneously take up arms to resist the invading forces, without having had time to form themselves into regular armed units, provided they carry arms openly and respect the laws and customs of war.