He served in the TANG and was issued an NGB Form 22 according to the records

Where is his "Honorable Discharge"? That's a certificate suitable for framing.

http://users.cis.net/coldfeet/ANG22.gif

This link to the document you cite clearly shows that Bush fulfiled only 5
years, 4 months and 5 days service out of a six year commitment.

Walt