Is it rude to ask a Viet Nam vet "How long were you there?"

I was there for a year and I wouldn’t mind answering the question. I don’t recall anyone ever asking me though.
It’s pretty common to be asked when I was there.

I am considered a Viet Nam vet, even though my “distant shore” was Amarillo TX.

There are lots of Viet Nam era vets out there that stayed behind in support roles. Some, mostly guys, felt left out (for want of a better phrase) or guilty because they spent their time in the US, Guam or Japan, never seeing battle. So, they say “I am a Viet Nam vet,” when they are really a Vet from that time period.

I know what you mean. I was surprised to learn that technically I’m a Gulf War Vet (according to the VA) but if asked I’m a Gulf War Era Vet (and if anyone can find an honest way for me to shorten that phrase, I’ll be obliged). The closest I ever was to the Gulf was during a deployment to Diego Garcia as part of a military exercise. I was there when Saddam Hussein invaded Kuwait.

I think Chefguy has a great point here. Many Vietnam-era vets (myself included) felt we were thrust into a war with no purpose discernible by the average citizen and were later looked upon with distaste by some and guilt by others. I could not wait to be shut of the whole military experience, let alone ruminate on it.

On a related note, I read an article about the declining membership of org’s like the American Legion and VFW. I can see why that might be, because those particular groups (at least in my home) actively refused to have anything to do with us - vets or not, we were all ‘damn hippie draft-dodgers’ to a lot of them. They had their comfy little club and were more than willing to keep us out. They succeeded, too - I have a lot of vet friends and don’t know of any who have joined in all the intervening years.

The above comment is not meant to demean WW II/Korean War vets - I guess the Vietnam vets were just a different animal and hard to recognize as comrades , especially considering the vociferous ‘anti-war’ stance many of us had.