Annex to the Convention: Regulations respecting the laws and customs of war on land - Section I: On belligerents - Chapter I: The qualifications of belligerents - Regulations: Art. 1.
Article 1. The laws, rights, and duties of war apply not only to armies, but also to militia and volunteer corps fulfilling the following conditions:
1. To be commanded by a person responsible for his subordinates;
2. To have a fixed distinctive emblem recognizable at a distance;
3. To carry arms openly; and
4. To conduct their operations in accordance with the laws and customs of war.
In countries where militia or volunteer corps constitute the army, or form part of it, they are included under the denomination "army."