• During the final two years of his service obligation, Bush did not comply with Air Force regulations that impose a time limit on making up missed drills. Instead, he took credit for makeup drills he participated in outside that time frame. Five months of drills missed by the President in 1972 were never made up, contrary to assertions made by the White House.

Here's what military law expert Eugene Fidell had to say:

....nothing in Bush's military file shows he received prior approval to miss any of the required drills. Under Air Force regulations, Bush was non-compliant with his military service obligation the moment he missed more than one month of weekend drills and by the third month he was in serious breach of his duty. "By then," Fidell says, "you should be thrown out of the program or, if there is a draft, called up for active duty."