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• Weather data for 15 Jun 1944

• Yamato was sighted and reported by USS Seahorse east of Mindanao, Philippine Islands. ww2dbase [Main Article | Tabular Record of Movement | CPC]
• USS Cassin Young provided support for the Mariana Islands invasion. ww2dbase [Main Article | CPC]
• Light carrier Ryuho departed Guimaras, Philippine Islands to join what would become the Battle of the Philippine Sea. ww2dbase [Main Article | Tabular Record of Movement | CPC]
• USS Flying Fish detected a Japanese carrier force and reported the information to fellow submarines; this would lead to the sinking of carrier Shokaku by USS Cavalla several days later. ww2dbase [Main Article | CPC]
• USS Tunny sighted Luzon, Philippine Islands. ww2dbase [Main Article | CPC]
• Soviet forces battered the Finnish secondary defense lines on the Karelian Isthmus. ww2dbase [TH]
• American B-29 bombers based in China conducted a raid on Japan. ww2dbase [Main Article | CPC]
• American troops invaded Saipan, Mariana Islands. ww2dbase [Main Article | CPC]
• US Thirteenth Air Force established its headquarters at Momote Airfield, Los Negros Island, Admiralty Islands. ww2dbase [CPC]
• The Japanese Navy formed the 2nd Air Fleet with 141st, 345th, and 762nd Air Groups with Vice Admiral Shigeru Fukudome in overall command and Rear Admiral Ushie Sugimoto as the chief of staff. ww2dbase [Main Article | CPC]

• Before dawn, 325 Lancaster bombers of RAF Bomber Command attacked Le Havre, France sinking the torpedo boats Falke, Jaguar, and Möwe of the German 5th Torpedo Boat Flotilla and 14 other smaller schnellboots of the 5th and 9th Flotillas, plus many auxiliary naval craft and harbour vessels. During the day, US VIII Corps (Major General Troy Middleton) became operational with the 90th Infantry Division and both US Airborne Divisions under its command, and was tasked with protecting the rear of the imminent attack to capture Cherbourg. ww2dbase [Main Article | TH, AC]

• US Navy 142nd Construction Battalion relieved the 39th Construction Battalion in the construction of the Naval Air Station Kahului in US Territory of Hawaii. ww2dbase [Main Article | CPC]
• Barbers Point Naval Air Station: Parts of Air Group 20 on board. ww2dbase [Main Article | DS]

• Landing ship No. 105 was completed. ww2dbase [Main Article | CPC]
• Landing ship No. 134 was launched. ww2dbase [Main Article | CPC]
• Landing ship No. 153 was completed. ww2dbase [Main Article | CPC]

• USS New Mexico bombarded Saipan, Mariana Islands. ww2dbase [Main Article | Event | CPC]

• The first of the German summer convoys from Kirkenes, Norway set out on route to Petsamo, Finland with a strong escort and under a heavy smoke screen; it arrived at Petsamo without loss despite attacks from Soviet cutters and aircraft. On the same day, another convoy of ten ships was sighted by Soviet aircraft near Hammerfest, Norway under escort by the 5th MS Flotilla commanded by Commander Erich Klünder. The escorts drove off the Soviet submarines but in attacks by Il-2 aircraft of Ground Attack Regiment 46, the 7,418-ton freighter Florianopolis was hit. Il-4 torpedo aircraft sank 1,160-ton Dixie with parachute torpedoes. The mines laid by the Soviets on the convoy's route off Kirkenes, Norway were cleared by German minesweepers but Soviet bombers hit and damaged the 1,112–ton Marga Cords outside the port. ww2dbase [HM]

• USS Bluefish attacked a Japanese transport in the Celebes Sea; all 5 torpedoes missed., ww2dbase [Main Article | CPC]

• Shokaku departed Guimaras, Philippine Islands with Mobile Fleet to counter the American invasion of the Mariana Islands. ww2dbase [Main Article | Tabular Record of Movement | CPC]

• USS Segundo arrived at New London, Connecticut, United States. ww2dbase [Main Article | CPC]
• USS Wake Island departed Norfolk, Virginia, United States. ww2dbase [Main Article | CPC]

15 Jun 1944 Interactive Map