The thing that you have to come back to when people raise the issue about whether or not the office had Selectrics - anybody using the DEFAULT SETTINGS in Microsoft Word can produce an EXACT to the micrometer replica of the memos in two minutes.
QED
Can you bring me up to speed, can a selectric perform all the tasks needed to recreate these memos? I am under the impression that it cannot.
Welcome to FR.
QED
Exactly correct.
Occams razor:
In its simplest form, Occam's razor states that explanations should never multiply causes without necessity. When two explanations are offered for a phenomenon, the simplest full explanation is preferable. If a charred tree is on the ground, it could be because of a lightning strike or because of a secret government weapons program. The simplest explanation that is sufficient is the logical one, according to Occam's razor, and there was a lightning strike.
Here's a very well-done page that explains and demonstrates that: http://peterduncan.net/CBS_Documents.html
Plus the commonsense reflection that a JAG office would have much better office equipment than the office of commander of a TANG squadron commander. Maybe, but just maybe the clerk-secretary would have one. By and large ANG get hand-me-downs of almost everything, especially office equipments.
Imagine trying to create a document that exactly matched the default settings of an unknown word processor that might be invented in a couple decades. Even if with modern word processors and the budget of NASA, you couldn't do it without a sample.