 This was the first commissioned submarine in the United States Navy, and purchased by the American Government on April 11, 1900 – a day later commemorated by the United States submarine community as "Submarine Day".Holland's company was then known as the Holland Torpedo Boat Company - the forerunner and precursor to the Electric Boat Division of General Dynamics Corporation.The United States government then ordered more submarines after the successful trials and purchase of "Holland VI".