If you're still interested in this issue, it's worth going to the site and reading.
http://www.glcq.com/pti_961.htmTHE MYSTERY OF “PTI 961” SOLVED
New information with regard to the meaning of a special code which appears on George W. Bush’s Air National Guard discharge papers indicates that he was being thrown out of the Air National Guard for failing “to possess the required military qualifications for his grade or specialty, or does not meet the mental, moral, professional or physical standards of the Air Force.” In other words, despite the fact that Bush had an unfulfilled six year Military Service Obligation, he was discharged from the Air National Guard not because he moved to Boston, but because he failed to meet his obligation to maintain his qualifications as an F102 pilot.
The special code is “PTI 961”, and is found<1> in the “Reason and Authority for Discharge” section of Bush’s NGB-22, his “Report of Separation and Record of Service in the Air National Guard of Texas and as a Reserve of the Air Force.”
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No actual “reason for discharge” is cited in this section. However, the reference to “ANGR 36-05
” provides us with enough information to determine that Bush was being thrown off for failure to fulfill his requirements.
“PTI” stands for “Personnel Transaction Identifier”, a code which “identifies the controlled personnel management action being accomplished the personnel data system.”<2> And although the particular meaning of “PTI 961” remains unknown, all “900” series PTIs mean that someone is no longer considered part of “Air Force strength.”<3>
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