Соответствующая норма
Practice Relating to Rule 106. Conditions for Prisoner-of-War Status
Section A. Distinction from the civilian population
Croatia’s LOAC Compendium (1991) states that combatants distinguish themselves from civilians by wearing a uniform, having a distinctive sign, being under a responsible command, being subject to the law of war and by “carrying arms openly at least: during every military engagement [and] as long as visible to the enemy while engaged in a military deployment”. 
Croatia, Compendium “Law of Armed Conflicts”, Republic of Croatia, Ministry of Defence, 1991, p. 6.
Croatia’s Commanders’ Manual (1992) states that combatants, members of the armed forces, “distinguish themselves by their uniform or by a recognizable distinctive sign or at least by carrying their arms openly”. 
Croatia, Basic Rules of the Law of Armed Conflicts – Commanders’ Manual, Republic of Croatia, Ministry of Defence, 1992, § 2.