"does it apply when it is civilians who are killed by US military in any foreign country"

Seems to - which is why some countries with US bases on their soil 'up for negotiation' have been coming the raw prawn over the last few years (look up about that big island south of Japan...). Uncle Sam has always displayed a strong negative attitude towards the locals about murder and rape committed by its soldiers, whether in war (which is why it won't sign certain international agreements about war crimes!) or peace (when it rapidly spirits the alleged wrongdoers back to the USA pronto!)...

Bit of a silly way to behave then wonder 'why does everybody hate us?'