As to self-typing vs. secretary-typing:
If the memo were typed by someone else, wasn't it common practice to put the typist's initials somewhere below the signature? Maybe 2-3 lines down left-justified?
FYI--I started in the biz world as a CPA in 1979 and never typed anything on my own for biz until 1982 or 1983.
That's been true every place I've worked.
The secretary would type and post script initials on the bottom left of the document, as well as the initials of those receiving copies i.e. CC would indicate that the document was carbon copied!
These are fakes!
Anything that pertained to MY military is in MY personal file, not my commanding officer's
"If the memo were typed by someone else, wasn't it common practice to put the typist's initials somewhere below the signature? Maybe 2-3 lines down left-justified?"
***
It still is. I do this for a living, and the common practice is the initials of the writer of the letter or memo in caps, followed by either a colon or a slash, and then the typist's initials in lower case.