Aside from the usual "did you kill someone?", what is the dumbest thing a civilian ever asked you about your service?

Another good one is "couldn't afford college?" Or couldn't make it in real life?
These are the people with absolutely no clue how difficult it actually is to qualify for service

So does everyone have to shower together in bootcamp because I heard they did, like guys and girls together..... That's hot.

I just rolled my eyes and walked away.

Sometimes it is difficult to answer questions in the normal fashion. I was a door gunner in an Air Cav unit in Vietnam. When I arrived back Stateside I diverted through San Francisco to check on a pilot I had extracted from a Huey crash along the Mekong River one night a week earlier (long story). He was in bad shape at Letterman Hospital. As I returned to the SF, CA airport to catch my flight home a group of West Coast young citizens were protesting the war in one of the hallways. They asked me how I could kill innocent women and children.

I simply ignored them and they found what they were looking for; a returning soldier in uniform to harass. I excused myself saying I had a flight to catch. Of course it turned into calling me an (explicative deleted) Baby Killer and other things. When this one loud mouth couldn't get my goat he spit on me. I dropped my duffle bag and explained in actions how naughty he had been. The uppercut to his chin expressed my displeasure. He laid down on the concourse to take a nap. The other 20 or so protesters seemed to take that for an answer.