One example from a true story about international peacekeeping missions. The rules of engagement often state that all actions must be in line with international law and the mandate of the mission. This means that troops are only allowed to use force to protect civilians, maintain peace, and uphold the rule of law in the area they are deployed. They have to be very cautious about collateral damage and avoid harming innocent people at all costs. They also need to coordinate closely with local authorities and other international forces involved in the mission.
Well, in certain police operations based on true events, the rules of engagement could be to always identify themselves clearly before taking any action. For example, when approaching a suspect, officers are required to announce their presence and their intention, like 'Police! Stop!' This helps in reducing misunderstandings and protects the rights of civilians. Also, the use of force should be proportionate to the threat. So if a suspect is unarmed and not being violent, non - lethal force should be the first option.