Your two samples don't even come close to overlaying exactly as do MS Word reproductions - using Word defaults - and the "1973" memos. Nobody denies that fonts and technology existed in 1973 which could produce those memos, only that:
a) it would be very unlikely that a typewriter this expensive would be used by the TANG in 1973
b) that a man whose widow says "he did not type" would be the only one to use it (no other documents like these in the records)
c) that the same man would take the time to do the fairly complex typesetting necessary and that
d) it would line up, by pure concidence, as an exact match to an MS Word doc. (as, again, these two examples do not.)