They say “Thanks’’. Mostly I meet men who were Korean War vets, Vietnam vets and occasionally WW2 vets, although, sadly because of the passage of time, WW2 vets are a rarity. I introduce myself, they respond in the same fashion. I ask innocuous questions, nothing probing or too personal. I don't dwell too much on asking questions. I'll mention family members who have served and then say "God bless you'', smile and take my leave.
Very nice, warm and caring way to handle the vet.
Thank you for all you do.