The ROE is stipulated in the contract if it’s not troop supplement or “combat advisory” the ROE will be very restrictive especially on the protection details contracts they are often not allowed to engage even at the clear signs of hostile action as long as it’s not targeted at them or US personnel.

As in they can witness a whole village being razed and wouldn’t be allowed to fire a single shot whilst a soldier would be compelled to engage and for the most part an order not to do so will likely be an illegal one.