Quote Originally Posted by jon1959 View Post
The Ministry of Defence use the term for a start:

https://modmedia.blog.gov.uk/2015/12...-need-to-know/

http://www.mirror.co.uk/news/uk-news...nocent-4915208

There are hundreds of examples if you do a quick search. The US military may have popularised the expression (to make the killing of civilians sound less like killing) but it is now used everywhere. Maybe the distinction you and TBG are looking for is 'unintended' or not rather than 'lawful' or not? Either way it is semantics.
I quoted a legal definition so I wasn't 'looking for' anything.