I'm almost ashamed I didn't notice it before. As I said, one of the classes I teach is business and professional writing. Students learn how to write resumes, cover letters, and...you guessed it--memos. One thing I have to constantly remind them is that unlike letters, memos are never signed at the bottom as this one is. Instead the writer simply initials it near the top. Now, obviously this may be a more modern convention, and in 1972 signing the memo may have been the way it was done. Also, the military may have required a signature. Can anybody out there confirm either of those two scenarios?