I have contacted Drudge, on the off-chance that he might be interested in this kind of thing. Also advised 60 Minutes (HaHaHa).
Sounds like an excellent point to me. To the best of my (admittedly hazy) recollection, proportional font wasn't a possibility until laser printers, which I don't remember before the early 80s, though I stand open to correction. I believe proportional print typewriters constituted a last-ditch attempt -- in response to word processing -- to keep the typewriter from going obsolete; I heard they were hard to use -- in any case they don't seem to have lasted.
Another odd thing about the one memo is where the writer refers to George W. Bush simply as "Bush." That doesn't look like the way military officers write a memo. They have procedures for everything in the military, including memo writing, and I'm sure their procedures would call for using a rank, first name, and middle initial (or at least the first two initials) to eliminate any uncertainty about names and identities. Military officers don't write sentences like "Bush called and said he wanted a transfer." They would write something like "Lt. George W. Bush called and requested a transfer." These memos also have a strange choice of details in them, with a lot of inexplicable references to Bush's political campaign work and "our investment in him." They look like they were written by somebody who's trying to discredit George W. Bush. Well his commanding officers would have not reason to discredit him, so these memos may well be forgeries and a classic political dirty trick. Keep digging, we're on the right track.
The IBM Selectric could do those things & was the first choice by professional typists of that day.