ive had relatives that i know killed enemy in ww2.
one of them finished the war in west germany, and made it all the way home, he recently passed just this year. he was decorated including a purple heart received in west germany.
the other served in the pacific and was killed on the island of luzon.
i have 2 springfield m1 garands. one of them a 5.8 mil s.n., which places it near the end of production in the late 1950's, so im pretty sure it never saw combat action.
the other however is a 2.7 million s.n. which places it coming off the line and into service in early 1944, which was well into the pacific campaign, and just a few months pryor to D-DAY.
i cant say whether or not it ever killed anyone, but it could have. the timeline certainly suggests the possibility.
if it was asked to do so by its human, then i am sure that it complied.
it doesnt bother me at all. (im just glad im not required to speak german or japanese to possess it.)