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• The US 7th Army crossed into Germany from Alsace, France. ww2dbase [AC]
• US troops landed on Mindoro, Philippine Islands. ww2dbase [Philippines Campaign, Phase 2 | TH]
• Submarine I-369 was assigned to Submarine Squadron 7 of the Japanese 6th Fleet. ww2dbase [I-369 | CPC]
• HMS King George V arrived at Trincomalee, Ceylon. ww2dbase [King George V | CPC]
• The Japanese Navy 3rd Air Fleet attached to the Combined Fleet grew to the strength of two air flotillas and 10 air groups. The 13th Air Group attached to the Southwest Area Fleet was reorganized to contain one air flotilla and two air groups. ww2dbase [CPC]
• USS Pintado set sail for Australia. ww2dbase [Pintado | CPC]
• USS Hawkbill sank Japanese destroyer Momo. ww2dbase [Hawkbill | CPC]
• USS Bailey conducted training exercises with 4 other destroyers off San Diego before departing northward for San Francisco, California. ww2dbase [Bailey | DS]
• USS Nicholas arrived at Seeadler Harbor, Manus, Admiralty Islands and moored alongside the tender USS Whitney. ww2dbase [Nicholas | DS]
• T10 was damaged by a near-miss. ww2dbase [T10 | CPC]

• Noted American dance band leader Glenn Miller departed England, United Kingdom aboard a Noorduyn C-64A Norseman aircraft piloted by Flight Officer John R. S. "Nipper" Morgan for Villacoublay, France. The aircraft disappeared somewhere over the English Channel. ww2dbase [Glenn Miller | C-64 Norseman | English Channel | AC]

• The keel of U-3042 was laid down at the AG Weser shipyard of Deschimag in Bremen, Germany. ww2dbase [U-3042 | Deutsche Schiff- und Maschinenbau AG | Bremen, Weser-Ems | CPC]
• The USAAF 306th Bomb Group flying from RAF Thurleigh launched a bombing raid against Kassel, Germany. ww2dbase [RAF Thurleigh | Bombing of Hamburg, Dresden, and Other Cities | Kassel | DS]

• USS Archerfish arrived at Guam, ending her fifth war patrol. ww2dbase [Archerfish | CPC]

• USS Wake Island departed Pearl Harbor, US Territory of Hawaii. ww2dbase [Pearl Harbor Navy Base and Ford Island Naval Air Station | Wake Island | Honolulu, Oahu | CPC]
• Barbers Point Naval Air Station: Simulated amphibious maneuvers were held just off the southwest corner of this base. Attending the maneuvers, and guests at this station, included Vice Admirals Mark [sic] A Mitscher, and George D Murray. ww2dbase [Barbers Point Naval Air Station | Ewa, Oahu | DS]

• USS Dragonet struck an underwater obstruction near Matsuwa in the Kurile Islands, Japan (now Matua, Russia) in the morning and flooded her forward torpedo room, forcing her to surface and escape. ww2dbase [Dragonet | Matsuwa, Hokkaido | CPC]
• Japanese Navy 6th Fleet established Submarine Squadron 1 for the operation of long range carrier submarines. By this time, however, none of the Seiran attack aircraft were ready for operational service. ww2dbase [M6A Seiran | CPC]
• Japanese Navy formed 631st Naval Air Group for the operation of submarine-borne attack seaplanes. ww2dbase [CPC]
• Landing ship No. 147 was launched. ww2dbase [No. 101/103-class | CPC]
• Captain Yoshiro Fujimaki was named the commanding officer of Kamoi while the ship was at Yokosuka, Japan. ww2dbase [Kamoi | Yokosuka, Kanagawa | CPC]

• USS Spot arrived at Saipan, Mariana Islands. ww2dbase [Spot | Saipan | CPC]

• USS Preston guarded carriers while the carriers launched strikes against Luzon, Philippine Islands. ww2dbase [Preston (Fletcher-class) | CPC]

• USS Honolulu transited the Panama Canal and moored at Cristobal, Canal Zone. ww2dbase [Panama Canal | Honolulu | Gatun Locks | DS]

• USS Ticonderoga launched Air Group 80 aircraft for 6 strikes against Japanese positions in northern Luzon, Philippine Islands. ww2dbase [Ticonderoga | DS]
• USS Marcus Island's air group shot down three Japanese aircraft off Mindoro, Philippine Islands; two aircraft crashed in the water near her and caused minor damage and some casualties. ww2dbase [Marcus Island | CPC]
• USS Wasp's aircraft attacked Japanese airfields on Luzon, Philippine Islands. ww2dbase [Wasp (Essex-class) | CPC]
• SB No. 120 (formerly landing ship No. 106) was sunk by US aircraft in Lingayen Gulf, Philippine Islands. ww2dbase [No. 101/103-class | Lingayen Gulf | CPC]
• USS New Mexico began supporting the operations on Mindoro, Philippine Islands. ww2dbase [New Mexico | CPC]
• USS Portland covered the landings on Mindoro, Philippines. ww2dbase [Philippines Campaign, Phase 2 | Portland | Mindoro | DS]

• William Leahy was promoted to the rank of fleet admiral. ww2dbase [William Leahy | CPC]
• Escort carrier USS Bogue and her task group arrived at Norfolk, Virginia. ww2dbase [Bogue | Norfolk Navy Yard | Norfolk, Virginia | DS]

15 Dec 1944 Interactive Map