That font in 1947
I haven't read hardly any of it--I mean, why bother, right?--but I thought I saw a part that said "this report has been prepared in 1986 as a blah blah for a blah blah," so I don't think that would apply.
I also don't find font analysis to be all that important at this juncture. At this point, either more and more documents are legitmately being revealed--or,
more and more ridiculous amounts of effort are being poured into a psyop spanning decades. That would arguably be a more interesting story than actual,
literal green men.