I dont get asked this one all the time.
I dont tell most people I was in the Marines. When conversation gets to what I did, early on in life, I say, "I was in the Military." Sometimes thats enough for them.
If I get pushed on from there, its usually asking if I went overseas. So I tell them I went to Afghanistan, twice. That usually shuts most people up. A few of them even over something like, "Thank you for your service" Which I take for whatever its worth. But there is a certain type of person, that will push it further, and ask-
"Did you kill anybody?"
Its always been a guy, that asks that. Usually a guy in his twenties. The kind of guy that slam guzzles mountain dew, or joins a fraternity in college. The kind of guy who might know someone, vaguely, who is in the military, but probably doesnt. The kind of guy that spends hours and hours on mindless video games with digitized idealizations of violence.
I can see into your head, when you ask me that. Into your heart. You are weak. You have always been weak. You live in a soft little world where things are spelled out for you, where you sleep in a bed every night. No one dies in your world unless they are old. No one goes hungry. No one sits in the rain for hours, or the cold, waiting for some horrible event that may never happen.
I tell them all the same thing, I dont want to talk about it. And then I make it a point to never talk to them about anything, ever again.