While I’ve got any number of issues with Dubya, his military service during the Vietnam era isn’t one of them. Flying Century-series fighters was hardly a risk-free endeavor, if you look at the number of deaths in training and operations. Plenty of rear echelon jobs in Vietnam were much less risky, from an actuarial perspective.
Putting this as you do seems less than honest about the facts of that matter. If you want to attack Jeb on this issue, fine, but leave Dubya out of it unless you want to sound like a dishonest Lefty.
My uncle was in the National Guard during the Vietnam war. They did much of the stateside work that still needed doing. His was a transportation company so he spent a lot of time processing vehicles through.
I also know a guy who was regular army and spent the duration of the Korean war in Alaska guarding American military prisoners. He was no less a soldier than his brother who did go to Korea and came back a real mess.