I have just glanced at the suspect documents and don't have any firm opinions yet, but let me tell you some things you'll want to look for to determine if they're forgeries.
Most correpsondence in the 1970s was prepared using IBM Selectrics (not the model you have shown) outfitted with either a 10 pitch Pica ball or a 12 pitch Elite ball. These documents might have been prepared using a 12 pitch Elite ball, but the type seems too proportional and large to me.
There were NO superscript characters on a Selectric ball. You simply typed the lower-case letters following the number. Air Force and Air Guard abbreviation practice followed the mandates of AFR 10-1 and were different from those used by the Army. For example, lieutenant colonel was "Lt Col" (space between the two, no periods) not "Lt. Colonel" or "LTC." Similarly, it was "1st Lt" not "1LT." Now, some clerks were sloppy and used non-standard abbrevitions, but most 702Xs were careful to do it right (and, BTW, no lieutenent colonel typed his own letters and memos).
The first page of the original copy of most official correspondence was invariably prepared on preprinted letterhead. Until the 1980s the official seal appeared in the upper-right hand corner of the page. None of these documents is shown on official letterhead meaning they are at best file copies. Ordinarily one would find a copy distribution list at the bottom of the page indicating where each copy went.
Copies were prepared on yellow and white carbon sets and had a distinct smudgy indistinct hard-to-read (especially after two copies) carbon look and feel to them. The suspect documents seem a bit too distinct to me to be carbon copies.
The paper used for official correspondence in the 1970s was smaller than 8 1/2 x 11. I can't remember the exact dimensions but they were something like 8 x 10. You could expect standard one inch margins on this format.
Typing-errors were ubiquitous. A well-typed page might have as few as two or three errors, but rarely none. No one--and I mean not even the most obsessive compulsive anal retentive admin clerk--bothered to retype a letter that had mistakes. Every admin clerk used white-out by the gallon and correction tape by the mile. Corrections were especially noticeable on carbon copies. There should be a standard four-line spacing between the final line of text and the signature block. I will have to doublecheck on this, but I seem to recall that the signature block was supposed to be flush with the left margin.
The Selectric doesn't do porportional spacing. There is a "Selectric-Composer" that does, but it is not likely to be used in a regular office.
There were NO superscript characters on a Selectric ball. You simply typed the lower-case letters following the number.
I don't disagree with that. The general conclusion that some are jumping to is that teh proportional spacing and "superscript st" are CONCLUSIVE proof that the document could not have been prepared on a typewriter in the early 1970's. I think other evidence is required.