A major tipoff that this is a forgery is the "th" in the 111th. It is miniturized automatically. They didnt have that in 1972.
http://www.cbsnews.com/htdocs/pdf/BushGuardmay4.pdf
Go to this link, look at #2 where it says, "Report to 111th F.L.S...... Look at the th in the "111th'. It is miniturized!!!!
11th (th miniaturized) -- excellent observation. By the way, these IBM Selectrics may have started appearing by then in well-heeled offices, but the ANG is never well-heeled. The National Guard even today gets the Army's castoffs, from exceedingly old desks to decrepit filing cabinets to ancient typewriters. No way, NO WAY, would they have had a technological marvel, expensive new typewriter in their office. More likely was a 1940s hand-me-down. The suggestion that their office would have had a new IBM floating ball typewriter is absolutely ludicrous. (And of course, it wouldn't have created the diminutive th in 11th, anyway.)