If you fire up Word with default margins and default font (Times New Roman at 12 pts), and type the text of the memos yourself, the results are exactly the same as the pdfs of the actual memos. Characters line up with characters on adjacent lines perfectly. (I did this myself with the last memo.) It's hard to avoid the conclusion that not only are these memos fake, they're not even very good fakes. I hope this ends Rather's career.
It will have as much effect on CBS as planting firebombs on Chevy pickups to fake fires from collisions had on ABC.