Your a good detective or someone may know.
The following letter told Bush to report before May 14, 1972. That is a Sunday deadline. Is that common in the military ? I know its not a common deadline in business.
http://www.cbsnews.com/htdocs/pdf/BushGuardmay4.pdf
I don't know about Sunday being a common deadline. It sounds odd and very unlikely to me.
Someone upthread noted that memo #4 is dated August 18, 1973, which was a Saturday (I double checked and they were correct). That Saturday memo is filled with references to other entities and "today" as if a group and people were all confabbing on that exact day. Another unlikely and odd occurrence.