Belly,

There were no Australian Coast Watchers anywhere North of the Hawaiian Islands to inform the US of Japanese movements; from whence did you get your information?

Mhaze,

"Coincidentally the vital US Aircraft Carriers, which played an important part in the defeat of Japan, were at sea."

Yes, a coincidence, as I said.

Dear Belly,

We need to remember that giving information to the
people means giving information to the whole world.
We have a right to know - what's needed, but not everything.
However governments should keep important secrets - for
the sake of our national security. Things like the specifics
of our military plans, or the exact capabilities of our
weapons, are just two things that come to mind.

President Kennedy did not tell the American people about
the Cuban Missile crisis when the US was close to nuclear
war. He did not want to cause panic. Anyway you get the drift.

Foxy,

"Monday, October 22
President Kennedy addresses the American public and announces his plan to implement a naval blockade of Cuba. U.S. military alert is set at DEFCON 3 and Castro mobilizes all of Cuba's military forces

Sunday, October 28
The crisis is over. In a speech aired on Radio Moscow, Khrushchev announces the dismantling of Soviet missiles in Cuba and does not insist on his demands concerning the removal of U.S. missiles from Turkey.

Monday, October 29
President Kennedy orders US ships to remain on the quarantine line and authorizes continuation of low-level reconnaissance flights.

Wednesday, November 21
Just over a month after the crisis began, President Kennedy terminates the quarantine when Khrushchev agrees after several weeks of tense negotiations at the UN to withdraw Soviet IL-28 nuclear bombers from Cuba."
http://www.atomicarchive.com/History/cuba/timeline.shtml

It was hardly a secret and the 6 days between Kennedy's announcement and the Russian back down was plenty of time for panic

On a lighter note, keeping things secret from the enemy is sometimes mirth provoking.

Wireless operators in the UN forces in Korea were under strict instructions not to use slang words in transmissions as this could tell the enemy where they were from and could lead to the identification of their unit.

One Scots Officer, at an Orders Group, brought the house down when he asked what he was supposed to do about his mens' accents.

Is Mise,

The leaders of the US and the Soviet Union engaged in
a military stand-off - For 13 days in October 1962
the world came close to a nuclear war. President
Kennedy did not tell the American people until his TV
address on October 22nd.

http://www.history.com/topics/cold-war/cuban-missile-crisis

My memory tells me John F Kennedy was saved in part after he made contact with a missionary, maybe an Australian one?
In those days until recently missionary's had ham radio licenses and became coast watchers
Yes Foxy, some things we will never be told
And it truth it maybe better that way
But too some things that are hidden from us should not be
The aircraft carriers not being in port could point to knowing?