The United States Ships (USS) Arkansas and Wyoming were two Wyoming class dreadnought battleships built between 1909 and 1912. In 1906 the British Royal Navy launched HMS Dreadnought, a revolutionary designed ship with heavy guns and steam propulsion. Following the terms of the London Naval Treaty of 1930, the USS Wyoming became a training ship for the Naval Reserve Officers Training Corps (NROTC) visiting Europe in 1929-30 and 1934-35 with the USS Arkansas.