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Related Rule
Canada
Practice Relating to Rule 4. Definition of Armed Forces
Section B. Incorporation of paramilitary or armed law enforcement agencies into armed forces
III. Military Manuals
Canada’s LOAC Manual (1999) states: “If a party to a conflict incorporates paramilitary or armed law enforcement agencies into its armed forces, it must inform other parties to the conflict of this fact. These forces are then considered lawful combatants.” 
Canada, The Law of Armed Conflict at the Operational and Tactical Level, Office of the Judge Advocate General, 1999, p. 3-2, § 14.
Canada’s LOAC Manual (2001) states in its chapter entitled “Combatant Status”:
If a party to a conflict incorporates paramilitary or armed law enforcement agencies into its armed forces, it must inform other parties to the conflict of this fact. These forces are then considered lawful combatants. 
Canada, The Law of Armed Conflict at the Operational and Tactical Levels, Office of the Judge Advocate General, 13 August 2001, § 307.