1) It's inconceivable that someone would go to the trouble to center the address at the top of the page with a typewriter. If the page header was preprinted, maybe. I don't believe there were "memory" typewriters in 1972 that could have typed out the address on command. And centering with that proportional type? No way. You'd have to count the space taken up by each character manually.
2) Is the P.O. Box, 34567 just a wee bit suspicious?
3) I looked up the address (which you can read through the black mark), 5000 Longmont #8 in Houston Tx. That address does exist, just outside the 610 loop, I think in the Galeria area. But Yahoo maps give a different zip code for it than 77027. Perhaps the zip code changed, but that's pretty rare. Could anyone in Tx confirm this?
PO Box for the Guard unit Here [NOTE: this source my be questionable!!]