641st Naval Air Group

641st Naval Air Group
Unit name	641st Naval Air Group
Dates	1944–1945
Country	Empire of Japan
Branch	Imperial Japanese Navy
Type	Naval aviation unit
Role	Land-based torpedo and bomber operations
Size	Air group

641st Naval Air Group was an Imperial Japanese Navy land-based aviation formation active during the final year of the Pacific War (1944–1945). Raised amid emergency expansions after the Battle of the Philippine Sea and the Marianas campaign (1944), the group participated in defensive and anti-shipping operations during the Philippines campaign (1944–1945), the Battle of Leyte Gulf, and the subsequent Borneo campaign (1945). It operated alongside formations from the Combined Fleet, the Yokosuka Naval District, and cooperating units such as the 61st Air Flotilla and the Kanoya Air Group.

History

Formed in 1944 as part of the IJN's reorganization following losses at the Battle of the Philippine Sea and the Battle of the Coral Sea, the group drew aircrew from surviving elements of the Genzan Air Group and the Kagoshima Kokutai. During late 1944 the unit took part in counteroffensive sorties during the Leyte campaign and the Battle of Ormoc Bay, attempting to interdict United States Navy convoys and United States Army troop landings. In early 1945, as the Operation Iceberg preparations unfolded and the Battle of Okinawa loomed, the group was partially redeployed to support the Home Islands defenses and the Dutch East Indies defensive perimeter, operating under increased pressure from United States Army Air Forces and Royal Australian Air Force strikes.

Organization and Units

The 641st comprised several squadrons drawn from established IJN naval air flotillas, integrating veterans from the Tobata Air Group, the Kanoya Air Group, and remnants of the Yokosuka Air Group. Its administrative control passed between the Combined Fleet and the 1st Fleet depending on theater demands, coordinating with the 11th Air Fleet and the Southwest Area Fleet for regional operations. The group included bomber, torpedo, reconnaissance, and training flights which liaised with shore-based facilities at Kure Naval District and the Sasebo Naval District for maintenance and logistics. Liaison with the Imperial Japanese Army Air Service occurred occasionally during joint coastal defense operations near Taiwan, Palau, and Formosa approaches.

Aircraft Operated

Primary types employed included the Mitsubishi G4M (Allied reporting name "Betty") land-based bomber and the Nakajima B6N (Allied reporting name "Jill") torpedo bomber, supplemented by reconnaissance variants such as the Mitsubishi F1M and trainer conversions of the Kawanishi E7K. The unit also operated night-attack and kamikaze-modified airframes related to the Yokosuka D4Y dive bomber for special strike missions during the Battle of Leyte Gulf and coastal interdiction near Palawan and Mindoro. Aircraft maintenance and overhaul were supported by shore workshops patterned after depots at Maizuru and Hiroshima.

Combat Operations and Engagements

The group participated in sorties against Task Force 38 elements during carrier strikes following the Battle of the Philippine Sea and engaged United States Navy escort carriers during the Battle off Samar. It conducted torpedo attacks against convoy targets in the approaches to Leyte Gulf and performed reconnaissance over Surigao Strait in the run-up to the Battle of Leyte Gulf. During the Philippines campaign (1944–1945), the group engaged United States Army Air Forces heavy bombers and naval fighters in defensive interceptions, suffering losses to Grumman TBF Avenger and F4U Corsair squadrons. In 1945, elements supported coastal defense during the Borneo campaign (1945) and mounted sorties against Allied shipping near Balikpapan and Samarinda, at times coordinating with kamikaze units attached to the Special Attack Units.

Commanders and Personnel

Commanding officers rotated among experienced IJN aviators drawn from veteran staffs such as those of the Kanoya Air Group and Genzan Naval Air Group. Senior staff included pilots and navigators who had seen action in the Guadalcanal campaign, the Solomon Islands campaign, and the New Guinea campaign (1942–1945). The unit featured flight commanders who previously served under notable IJN leaders associated with the Combined Fleet and the Imperial General Headquarters, and its aircrews received awards such as commendations referenced in wartime IJN personnel rosters maintained by the Yokosuka Naval District.

Bases and Deployment Locations

The 641st was based at several dispersed shore installations, including forward airfields on Leyte, rear-area bases at Palau, and maintenance stops at Taiwan airfields. Later deployments moved assets to the Home Islands logistics hubs at Sasebo and Kure while detachments operated from Indonesian sites such as Balikpapan and Tarakan to defend the Dutch East Indies oil fields. The group's movements mirrored IJN strategic withdrawals from Philippine Sea perimeter positions to consolidate defense of the Home Islands and remaining Pacific holdings.

Category:Imperial Japanese Navy air units Category:Military units and formations established in 1944 Category:Military units and formations disestablished in 1945