"Mr. Bush favored the war in Vietnam, but he had the necessary clout to ensure that he wouldn't have to serve there. He entered the Texas Air National Guard at the height of the war in 1968 by leaping ahead of 500 other applicants who were on a waiting list.
Mr. Bush was eventually assigned to the 147th Fighter Group (later to become part of the 111th Fighter Interceptor Group), which Mr. Moore described in his book as a "champagne" outfit. "The ranks," he said, "were filled with the progeny of the wealthy and politically influential."
So here's the thing: After strolling to the head of the line, and putting the Guard to the considerable expense of training him as a pilot, Lieutenant Bush didn't even bother to take his duties seriously. He breezed off to Alabama to work on a political campaign. He never showed up as required to take his annual flight physical in 1972, and because of that was suspended from flying.
This cavalier treatment of his duties as a Guardsman occurred as thousands of others were being killed and wounded in Vietnam — youngsters of great promise like Roy Dukes, who was 20 when he died. Having escaped the horror of the war himself, one might have expected Lieutenant Bush to at least take his duties in the National Guard seriously."
http://www.nytimes.com/2004/02/13/opinion/13HERB.html