57 years ago today, on 4 July, 1969, Gato-class submarine USS Drum (SS-228) was dedicated and opened to the public.
MuseumShip at the USS Alabama Battleship Memorial Park, Mobile, AL

57 years ago today, on 4 July, 1969, Gato-class submarine USS Drum (SS-228) was dedicated and opened to the public.
MuseumShip at the USS Alabama Battleship Memorial Park, Mobile, AL

81 years ago today, on 4 July 1945, Des Moines-class heavy cruiser USS Salem (CA-139) was laid down by the Bethlehem Steel Co.'s Fore River Shipyard, Quincy, Mass.
MuseumShip USS Salem, Quincy, MA
115 years ago today, on 4 July 1911, TSS Earnslaw was laid down at McGregor and Company, Dunedin, New Zealand.
MuseumShip at RealNZ, Queenstown, New Zealand
On 3 July 1952, SS United States starts her maiden voyage. During her maiden voyage the United States broke the transatlantic speed record held by the RMS Queen Mary for the previous 14 years by over 10 hours, making the maiden crossing from the Ambrose lightship at New York Harbor to Bishop Rock off Cornwall, UK in 3 days, 10 hours, 40 minutes at an average speed of 35.59 knots (65.91 km/h; 40.96 mph).
83 years ago today, on 3 July 1943, Liberty-ship SS Jeremiah O'Brien entered service with the War Shipping Administration.
SS Jeremiah O'Brien, National Liberty Ship Memorial, San Francisco, CA