War II persecution of Serbs: Gudovac massacre – Members of the Croatian nationalist Ustashe movement kill around 190 Bjelovar Serbs in the village of Gudovac, in the Independent State of Croatia. May May 1 The breakfast cereal Cheerios is introduced as CheeriOats by General Mills in the United States. Orson Welles' film Citizen Kane premieres in New York City. The first Defense Bonds and Defense Savings Stamps go on sale in the United States, to help fund the greatly increased production of military equipment. May 2 – Anglo-Iraqi War: British combat operations against the rebel government of Rashid Ali in the Kingdom of Iraq begin. May 5 – WWII: Emperor Haile Selassie enters Addis Ababa, which has been liberated from Italian forces; this date is subsequently commemorated as Liberation Day in Ethiopia. May 6 – At California's March Field, entertainer Bob Hope performs his first USO Show. May 8 – WWII: The German auxiliary cruiser Pinguin is sunk by British cruiser in the Indian Ocean; 555 are killed. May 9 – WWII: is captured by the British Royal Navy. On board is the latest Enigma cryptography machine, which Allied cryptographers later use to break coded German messages. May 10 WWII: The British House of Commons is damaged by the Luftwaffe in an air raid on London. Rudolf Hess parachutes into Scotland, claiming to be on a peace mission. May 11/May 12 – WWII: The Ustaše massacre 260–373 Serb men in a Catholic church in Glina, Croatia, where the men have assembled to be received into the Catholic faith in exchange for their lives. May 12 – Konrad Zuse presents the Z3, the world's first working programmable, fully automatic computer, in Berlin. May 13 – WWII: Yugoslav General Draža Mihailović and a group of 80 soldiers and officers cross the Drina river in Bosnia and Herzegovina, arrive at Ravna Gora, in western Nazi-occupied Serbia and start fighting with German occupation troops. May 15 The first British jet aircraft, the Gloster E.28/39, is flown. Joe DiMaggio's 56-game hitting streak begins, as the New York Yankees' center fielder goes 1 for 4 against Chicago White Sox pitcher Eddie Smith in baseball. May 19 – The Viet Minh is formed at Pác Bó in Vietnam, to overthrow French rule of the nation, as an alliance between the Indochina Communist party, led by Ho Chi Minh, and the Nationalist party. It will become the Viet