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• USAAF and RAF began a coordinated air offensive with the RAF over Europe, conducting area bombing at night and the USAAF flying precision bombing raids by day. The British Assistant Chief of the Air Staff noted that the primary objective of bombing campaign was "the destruction of German air-frame, engine and component factories and the ball-bearing industry on which the strength of the German fighter force depend" and the secondary objective was "the general disorganization of those industrial areas associated with the above industries". ww2dbase [Bombing of Hamburg, Dresden, and Other Cities | TH]
• Doneff was commissioned into service. ww2dbase [Doneff | CPC]
• HMS Cumberland arrived at Spitzbergen, Norway for Gearbox support operation. ww2dbase [Cumberland | DS]
• The keel of what would become USS Blackfin was laid down. ww2dbase [Blackfin | CPC]

• Barbers Point Naval Air Station: Air Group 9 departed for USS Essex. ww2dbase [Barbers Point Naval Air Station | Ewa, Oahu | DS]

• Doolittle Raiders Jack Sims and James Doolittle piloted a B-26 Marauder bomber of 442nd Bombardment Squadron of US 320th Bombardment Group on a mission to attack Pantelleria, Italy. ww2dbase [James Doolittle | Battle of Pantelleria and Pelagie Islands | Sicilia | CPC]

• USS Flying Fish damaged a Japanese transport off Japan, hitting her with 1 of 3 torpedoes fired. ww2dbase [Flying Fish | CPC]

• Hiyo, Yugure, and Ariake deparated Yokosuka, Japan at 1400 hours. About 17 miles off Miyake Island at 1852 hours, USS Trigger fired six torpedoes at Hiyo, scoring two hits. In the darkness, at 1937 hours, Hiyo opened fire on Yugure while Yugure swept for the American submarine, killing two and wounding five. Yugure's No. 3 turret's shield was also damaged. Nevertheless, Yugure and Ariake would remain on anti-submarine patrols around Hiyo through the night. ww2dbase [Hiyo | Yugure | Trigger | AC, CPC]

• Vice Admiral Masakuni Yamagata was named the commanding officer of Takao Guard District in southern Taiwan. ww2dbase [Takao Guard District | Takao | CPC]

• British Admiralty introduced Naval Cypher No. 5, replacing No. 3 and No. 4, finally ending the German ability to read British naval orders. ww2dbase [Enigma Code Broken | CPC]

• While under construction, Shamrock Bay's hull number changed from ACV-84 to CVE-84. ww2dbase [Shamrock Bay | Vancouver, Washington | CPC]
• The work to extend HMCS Trillium's forecastle at Boston Navy Yard, Massachusetts, United States was completed. ww2dbase [Trillium | Boston Navy Yard | Boston, Massachusetts | CPC]

10 Jun 1943 Interactive Map