Related Rule
Benin
Practice Relating to Rule 106. Conditions for Prisoner-of-War Status
Section C. Situations where combatants cannot distinguish themselves
According to Benin’s Military Manual (1995), combatants “distinguish themselves … at least by carrying arms openly”. 
Benin, Le Droit de la Guerre, III fascicules, Forces Armées du Bénin, Ministère de la Défense nationale, 1995, Fascicule I, p. 12.