More buggin' 'bout Bush

The main difference between W and a "coaster"—someone who makes a career out of coasting on their past achievements—seems to be that Bush has no identifiable past achievements to coast on. However, as Kevin Drum points out, that doesn't mean Bush's past hijinks aren't darned interesting.

By itself, this might or might not be a big deal. However, in addition to a disturbingly large number of still unanswered questions about his service, it's clear that in mid-1972 Lt. Bush decided to skip his required annual physical and quit flying — and apparently nobody complained. He then missed five months of drills and was never required to make them up. Despite this, in 1973 he was transferred to the Air Reserve Personnel Center in Denver, no disciplinary was action taken, and in 1974 he was honorably discharged.

Who pulled the strings to make this happen? And why?