>> “... Japanese government knew radiation was being leaked and did not inform the U.S. Navy.”
Hard to imagine the US didn’t know.
“Hard to imagine the US didn’t know.”
A nuclear aircraft carrier would have radiation detection equipment. I can’t imagine the captain didn’t deploy it and get a running report on conditions. So, it would be the US Navy that didn’t inform the crew.
It certainly was the responsibility of the US navy to do its own monitoring wherever we sent our soldiers.