A U.S. sailor has been declared lost at sea after initially being reported missing last month, according to the U.S. Naval Institute.

What we know:

According to the private non-profit military association , Jose Antonio Rivera Lynch IV, 19, a third-class aviation boatswain’s mate, was assumed overboard from the USS George Washington.

The U.S. Navy and Australian Defence and Australian Border Forces launched search efforts in the Timor Sea on July 30.

What we don't know:

The U.S. Navy has not explained why Lynch may have gone overboard.

The backstory:

According to the institute, at 19, Rivera Lynch served in the Navy for just over a year.

A native of Middleburg, Fla., he enlisted at 17 through the delayed entry program, his father said. After graduating from high school in June 202

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