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• Adolf Hitler ordered downed Allied airmen to be shot without trial. ww2dbase [Adolf Hitler | CPC]
• Anglo-Indian troops captured Kanglatongbi, India. ww2dbase [Battle of Imphal-Kohima | CPC]
• USS Ray began pursuing a nine-ship Japanese convoy south of the Philippine Islands. ww2dbase [Ray | CPC]
• USS Flier completed her repairs and resumed her first war patrol. ww2dbase [Flier | CPC]
• USS Cero damaged a Japanese transport north of Dutch New Guinea, hitting her with 1 of 4 torpedoes fired. ww2dbase [Cero | CPC]

• Flying Officer Cornelius G. Hogelin was returning from a mission in northern Germany when his P-51 B Mustang fighter-bomber (43-24783) developed engine trouble as he was over the North Sea. He lost his life after radioing that he was ditching 16 kilometres west of Den Haag, the Netherlands. He was stationed at RAF Bottisham near Cambridge, England, United Kingdom and was in the 361st Fighter Wing. Aircraft belonging to this wing could be identified by a yellow cowling and stripe on the tail of their planes. Hogelin's body was never found and his name is entered upon the USAAF Memorial Wall in Cambridge. ww2dbase [North Sea | HM]

• 24 TBF, 20 SBD, a number of B-24, a number of P-39, and a number of New Zealand fighters and dive bombers attacked Vunakanau Airfield at Rabaul, New Britain. 1 TBF aircraft was shot down by anti-aircraft fire, and its crew was captured by the Japanese. ww2dbase [New Guinea-Papua Campaign, Phase 3 | Rabaul, New Britain | CPC]

• An explosion on a LST moored in Pearl Harbor, US Territory of Hawaii set off a chain reaction that caused massive damage to shipping and installations and heavy loss of life. ww2dbase [Pearl Harbor Navy Base and Ford Island Naval Air Station | Honolulu, Oahu | AC]

• Landing ship No. 107 was launched. ww2dbase [No. 101/103-class | CPC]

• USS Wasp set sail for Wake Island. ww2dbase [Wasp (Essex-class) | CPC]

• Four trains arrived at the Auschwitz Concentration Camp in Poland with 12,438 Hungarian Jews (3,013 from Viseu de Sus (Felsövisó), 3,274 from Nyiregyháza, 3,290 from Sátoraljaújhely, and 2,861 from Mukacevo (Munkács)) and 2,000 Jews from Yugoslavia. 1,102 were registered into the camp; 2,698 were sent to the gas chambers. ww2dbase [Discovery of Concentration Camps and the Holocaust | Auschwitz Concentration Camp | Oswiecim | CPC]

• Submarine Boarfish was launched at Groton, Connecticut, United States, sponsored by Miss Barbara Walsh, daughter of Senator Arthur Walsh of the US state of New Jersey. ww2dbase [Electric Boat Company | Boarfish | Groton, Connecticut | CPC]

• USS Pintado departed Midway Atoll. ww2dbase [Midway Bases | Pintado | Midway | CPC]

21 May 1944 Interactive Map