I have an old Reader's Digest book here, I bought it at a Goodwill store
not many years ago.There is a story/article (true or not, I don't know)
in that Reader's Digest book that I read.
That story/article is about a few years before the attack on Pearl
Harbor December 7,1941, U.S.Navy ''rehearsed'' the attack on Pearl
Harbor.There were some Japanese people in Hawaii and other Islands and
areas and they paid very close attention to what U.S.Navy did.

You might find that story/article on the internet.Look around for it.
cuhulin