Perhpas because there's more substance than birthers have? Just saying.
Anyway, let's start with an overview to refresh our memories:
Irregularities in Bush’s transfer requestOn May 26, Bricken, (commander of the 9921st), approved Bush’s application for transfer. Bricken wrote: “You already understand that this is a Training Category G, Pay Group None, Reserve Section MM proposition.” As an obligated Reservist, Bush was in “Training Category A,” which required the 48 periods of inactive duty training, and 15 days of active duty training, and was required to remain in that Training Category. Training Category “G” offered no training at all. According to Air Force regulations (AFM 35-3, paragraph 14-6), being in "Training Category A" meant that "If a member...will be unable to further train with his unit because of an impending change of residence,...he is required to sign a statement that he has been counseled." That counseling included notifying Bush of his obligation to find a new unit with which he could fulfill his training obligations. [21]
Transfer request is rejected and subsequent performanceThroughout this period, Bush remained obligated to train with his Texas unit, or perform substitute training each month. Bush’s records show that he is credited with no training during these months.[22] Colonel Bricken is on record as stating that Bush made no effort to participate as a Guardsman with the 9921st.[23]
More than a month after the ARPC rejected Bush's transfer request, on September 5, 1972, Bush requested permission to "perform equivalent duty" at the 187th Tactical Recon Group in Alabama "for the months of September, October, and November." He quickly received approval to do so, and was told to report to Lt. Col. William Turnipseed, the base commander, for drills on October 7 and 8, and November 4 and 5 (the September drill dates of the unit had already passed). Bush's grandfather, former U.S. Senator Prescott Bush, died of cancer on October 8, and Bush served as a pallbearer at the funeral in Greenwich, Connecticut. Turnipseed has said that he could not recall whether Bush reported on those occasions.[24]
In 2004 John "Bill" Calhoun, a former Alabama Air National Guard officer who had served at the Dannelly Air National Guard Base in Montgomery, home of the 187th, claimed he had seen Bush report for duty "at least six times" between May and October 1972, and that Bush had in fact spent time in his office.[25] However, the payment and retirement records the White House handed out three days prior to Calhoun's claims show that Bush received no pay or attendance credits from April until the end of October 1972.[26]
George W. Bush military service controversy - Wikipedia, the free encyclopedia
The New York Times reported last February that it had interviewed 16 retired officers, pilots and senior enlisted men who served at the unit and found none who recalled Bush attending drills.
Pay records released in February show Bush wasn't paid for any drills between April 16, 1972 -- the last time he flew with his old unit in Houston -- and October 28 and 29 of that year, just before the conclusion of the Alabama senatorial campaign in which Bush was working. He was also paid for Nov. 11, 12, 13 & 14, shortly after election day. The pay records don't indicate where Bush was on those dates, but Bush has also produced a dental examination record showing he was at the Alabama base on January 6, 1973.
(snip)
Obligation Fulfilled?
Bush has always pointed to his honorable discharge as evidence that he eventually made up any deficiencies in drill attendance and fulfilled at least minimum requirements for service. But The Boston Globe reported Sept. 8 that it had conducted a "reexamination of the records" and concluded that Bush failed to meet the commitments he signed in May 1968, and again before he transferred out of his unit in mid-1973 to attend Harvard Business School.
Boston Globe: The reexamination of Bush's records by the Globe, along with interviews with military specialists who have reviewed regulations from that era, show that Bush's attendance at required training drills was so irregular that his superiors could have disciplined him or ordered him to active duty in 1972, 1973, or 1974. But they did neither.
FactCheck.org: Democratic Group's Ad Revives "AWOL" Allegation Against Bush