The forgerer must not have realized that back in that time period there were no street addresses used either and definitely not a post office box. It was only the name of the organization and Air Force Base, State, Zip Code. I found an official document thanks to a Freeper link to Pres Bush's documents from his jacket and then compared it to the forgery below:
Here is the address of the official document:
DEPARTMENT OF THE AIR FORCE
HEADQUARTERS 147TH FIGHTER WING (TANG)
ELLINGTON AIR FORCE BASE, TEXAS 77030
vs the forgery
11th Fighter Intercept Squadron
P. O. Box 34567
Houston, Texas 77034
Every organization in the Air Force went by USAF, USAFR, or TANG in the case of Texas or OKANG in the case of Oklahoma. That meant your organization was regular Air Force, Reserve Air Force or members of the Guard.
I posted some addresses from my own files and they are standard, just like Dubya's. Never P.O. Boxes. The format was name, office, unit, base, ZIP.