Misuse of protective signs, signals, and symbols … in order to injure, kill, or capture the enemy constitutes an act of perfidy. Such acts are prohibited because they undermine the effectiveness of protective signs, signals, and symbols and thereby jeopardize the safety of non-combatants and the immunity of protected structures and activities. For example, using an ambulance or medical aircraft marked with the red cross or red crescent to carry armed combatants, weapons, or ammunition with which to attack or elude enemy forces is prohibited.