Sorry for bringing up this old thread. I found it while searching for how a "war diary" or log was written and formatted in U.S. submarines. The term "deck log" was very helpful. Using Google, I found this nice site:
https://www.archives.gov/research/mi...deck-logs.html
esp.
https://www.archives.gov/research/mi...1941-1959.html
which describes the format,
and
https://www.archives.gov/research/mi...deck-logs.html
for submarines. So it seems while the standard deck log format was used, the deck logs of submarines didn't include any details on warfare itself. This kind of information was put in war reports instead. Since the 1960s, it seems, the deck logs of submarines barely contain any useful information at all other than "yep, we're on patrol". Instead classified secret deck logs are used.