One crew member had been rescued and "search and rescue operations are ongoing with multiple Coast Guard and Navy air and surface assets", the fleet said in a statement.
The MH-60S helicopter took off from the USS Abraham Lincoln during "routine flight operations" about 60 nautical miles off the coast of San Diego at 4:30 pm (2330 GMT), the fleet said on Twitter.
The navy did not state how many people were on board.
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