I just retired from the military (my contract was up) and I never had an issue with vaping pretty much anywhere, about the only time I got griped at was when the Duty Sargent saw the vapor when I was on guard duty and thought I was smoking weed

ended up striking up a decent conversation about it actually. Now in the civilian sector most people don't try to even understand, they see the vapor and freak out, I'm thinking of printing up some informational cards to give to them.