History of San Francisco would be used for loading the key fissile components of the first atomic bomb onto the USS Indianapolis in July 1945 for transfer to Tinian. The War Memorial Opera House which opened in 1932, was the site of some significant post World War II history. In 1945, the conference that formed the United Nations was held there, with the UN Charter being signed nearby in the Herbst Theatre on June 26. Additionally the Treaty of San Francisco which formally ended war with Japan and established peaceful relations, was drafted and signed here six years later in 1951. After World War
International Civil Aviation Organization convention, held in London in 1912 allocated the first radio callsigns for use by aircraft. ICAN continued to operate until 1945. Fifty-two countries signed the Chicago Convention on International Civil Aviation, also known as the Chicago Convention, in Chicago, Illinois, on 7 December 1944. Under its terms, a Provisional International Civil Aviation Organization (PICAO) was to be established, to be replaced in turn by a permanent organization when 26 countries ratified the convention. Accordingly, PICAO began operating on 6 June 1945, replacing ICAN. The 26th country ratified the Convention on 5 March 1947 and, consequently PICAO was disestablished on 4