This Day in U.S. Naval History - April 1
1893 - Navy General Order 409 of 25 February 1893 establishes the rate of Chief Petty Officer as of this date.
1917 - Boatswain's Mate 1/c John I. Eopolucci, a Naval Armed Guard on board the steamship Aztec, died when the vessel was sunk by a German U-boat. He was the first U.S. Navy sailor killed in action in World War I.