How about that - Bush volunteered for Viet Nam! Actually, he tried to but was rejected. Really. Newsweek covered this in February.

The standard rap against Bush is that he was ducking combat by joining the Guard. Actually, the Texas Air Guard had a program called Palace Alert that allowed pilots to volunteer for flight time in Vietnam. Three of Bush's fellow pilots—Udell, Woodfin and Fred Bradley—recalled to NEWSWEEK that Bush inquired with the base commander about signing up for Palace Alert. He was told no; he had too few flying hours at the time and his plane, the F-102, was by then deemed obsolete for air combat.

More details here.

"The Air Force, in their ultimate wisdom, assembled a group of 102's and took them to Southeast Asia. Bush volunteered to go. But he needed to have 500 [flight] hours, but he only had just over 300 hours so he wasn't eligible to go,” Morrisey recalls.