You mean were they ordered to gun down unarmed British citizens in the street?
No, no. They are just directives under which circumstances they may act. Often in most countries the rules of engagement comply with domestic and international law. If they don't comply with it, the rules of engagement are not valid. If said soldiers actually violate the rules of engagement given to them (assuming the rules comply with the aforementioned requirements for it to be valid), they should of course be jailed.
But yeah, if someone orders them to do this I guess they could be jailed as well
Apparently not but then if an officer or general gave the order they'd be jailed.
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Not surf what you mean.