May 1 – The Coca-Cola Company introduces its first diet drink, Tab cola. May 2 – Berthold Seliger launches near Cuxhaven a 3-stage rocket with a maximum flight altitude of more than 62 miles (the only sounding rocket developed in Germany). May 4 – The Le Monde Theater fire in Dioirbel, Senegal, kills 64 people. May 8 – Huế Phật Đản shootings: The Army of the Republic of Vietnam opens fire on Buddhists who defy a ban on the flying of the Buddhist flag on Vesak, the birthday of Gautama Buddha, killing 9. Earlier, President Ngô Đình Diệm allowed the flying of the Vatican flag in honour of his brother, Archbishop Ngô Đình Thục, triggering the Buddhist crisis in South Vietnam. May 13 – A smallpox outbreak hits Stockholm, Sweden, lasting until July. May 14 – Kuwait becomes the 111th member of the United Nations. May 15 – Project Mercury: NASA launches Gordon Cooper on Mercury-Atlas 9, the last Mercury mission (on June 12 NASA Administrator James E. Webb tells Congress the program is complete). May 22 – A.C. Milan beats Benfica 2–1 at Wembley Stadium, London and wins the 1962–63 European Cup (football). May 23 – Fidel Castro visits the Soviet Union. May 25 – The Organisation of African Unity is established in Addis Ababa, Ethiopia. June June 3 – Huế chemical attacks: The Army of the Republic of Vietnam rains liquid chemicals on the heads of Buddhist protestors, injuring 67 people. The United States threatens to cut off aid to the regime of Ngô Đình Diệm. June 4 – President of the United States John F. Kennedy signs Executive Order 11110, authorizing the Secretary of the Treasury to continue issuing silver certificates. June 5 – The first annual National Hockey League Entry Draft is held in Montreal. June 10 – In the United States: President John F. Kennedy signs the Equal Pay Act of 1963 into law. President John F. Kennedy delivers his American University speech, "A Strategy of Peace", in Washington, D.C. The University of Central Florida is established by the Florida legislature. June 11 – In Saigon, Buddhist monk Thích Quảng Đức commits self-immolation to protest the oppression of Buddhists by the Ngô Đình Diệm administration. June 13 The cancellation of Mercury-Atlas 10 effectively ends the United States' manned spaceflight Project Mercury. The New York Commodity Exchange begins trading silver futures contracts. June 15 – The