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Netherlands
Practice Relating to Rule 6. Civilians’ Loss of Protection from Attack
Section C. Situations of doubt as to the character of a person
The Military Manual (1993) of the Netherlands states: “In case of doubt whether a person is civilian, that person is considered to be a civilian.” 
Netherlands, Toepassing Humanitair Oorlogsrecht, Voorschift No. 27-412/1, Koninklijke Landmacht, Ministerie van Defensie, 1993, p. V-2.
The Military Manual (2005) of the Netherlands states: “If there is any doubt whether someone is a civilian, he or she is treated as a civilian.” 
Netherlands, Humanitair Oorlogsrecht: Handleiding, Voorschift No. 27-412, Koninklijke Landmacht, Militair Juridische Dienst, 2005, § 0505.
In its chapter on the protection of the civilian population, the manual states: “If there is any uncertainty whether someone is a genuine civilian, this person is given the benefit of the doubt pending proof to the contrary, and must be treated as a civilian.” 
Netherlands, Humanitair Oorlogsrecht: Handleiding, Voorschift No. 27-412, Koninklijke Landmacht, Militair Juridische Dienst, 2005, § 0805.