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| 653rd Kōkūtai | |
|---|---|
| Unit name | 653rd Kōkūtai |
| Native name | 第653海軍航空隊 |
| Country | Empire of Japan |
| Branch | Imperial Japanese Navy |
| Type | Naval Air Group |
| Formed | 1944 |
| Disbanded | 1945 |
| Notable commanders | Tomonobu Imamura, Mitsuaki Imai |
653rd Kōkūtai
The 653rd Kōkūtai was an Imperial Japanese Navy naval air group active in the late stages of the Pacific War, formed during the Empire of Japan military reorganization and deployed across the Philippine Campaign (1944–45), the Battle of Leyte Gulf, and the defense of the Dutch East Indies. Established amid Japan's shift to Kamikaze tactics and the intensification of Allied operations in the Philippines, the unit operated alongside other kōkūtai such as the 201st Kōkūtai, 252nd Kōkūtai, and 343rd Kōkūtai under directives from the Imperial General Headquarters, Ministry of the Navy (Japan), and regional commands including Combined Fleet headquarters.
The 653rd was constituted in 1944 following directives from the Imperial Japanese Navy General Staff during the aftermath of the Battle of the Philippine Sea and the Battle of the Sibuyan Sea, as part of efforts to bolster aerial assets after losses at Midway and Guadalcanal Campaign. Its formation paralleled reorganizations that affected units like the Kure Naval District, Yokosuka Naval District, and air groups transferred from Chitose Naval Air Group and Genzan Naval Air Group. The kōkūtai's operational timeline intersected with major events including the Battle of Leyte Gulf, Operation Sho-go, and the Invasion of Lingayen Gulf, and it suffered attrition during Task Force 38 carrier strikes and Operation Hailstone-style raids. Following disastrous losses during the Philippine Sea operations and the collapse of Japanese forward bases, the 653rd was reduced, reorganized, and ultimately dissolved amid the Surrender of Japan.
Organizationally, the 653rd mirrored other Imperial naval air groups with a chain of command tied to the Combined Fleet and coordination with the 1st Air Fleet and 11th Air Fleet. Its structure comprised multiple squadrons (chūtai) and flights (shōtai) led by officers commissioned through the Naval Academy (Etajima) and trained at Kasumigaura Air Group and Tsukuba Naval Air Group facilities; enlisted personnel received instruction at Atsugi Naval Air Station and Kisarazu Naval Air Group. The kōkūtai incorporated maintenance sections influenced by standards from the Navy Technical Department and logistics connected to the Yokosuka Naval Arsenal, while tactical doctrine drew on lessons from engagements involving the 6th Fleet (IJN), 2nd Fleet (IJN), and experiences shared with units like the 701st Naval Air Group.
The 653rd operated aircraft types common to late-war Imperial naval air groups, including models like the Mitsubishi A6M Zero, Nakajima B6N Tenzan, Yokosuka D4Y Suisei, and occasionally the Kawanishi N1K-J Shiden obtained via transfers from air groups such as the 343rd Kōkūtai and 601st Naval Air Group. For reconnaissance and liaison, the kōkūtai used seaplanes like the Mitsubishi F1M and floatplanes sourced from Navy Type 0 Reconnaissance Seaplane pools maintained at Rabaul and Truk Lagoon. Armament and ordnance included aerial torpedoes patterned after the Type 91 torpedo, bombs similar to those used in the Battle of the Java Sea, and retrofit provisions for kamikaze payloads modeled on attacks during Operation Kikusui. Maintenance relied on radio sets from the Navy Type 96 radio series and spare parts funneled through the Sasebo Naval District supply chain.
The 653rd engaged in defensive and offensive sorties during the Philippine Campaign (1944–45), providing air cover during the Battle of Leyte Gulf, countering raids by United States Navy carrier groups such as Task Force 38, and attempting interdiction against U.S. Seventh Fleet amphibious operations exemplified at Lingayen Gulf. The unit participated in night and day actions influenced by tactics used in the Solomon Islands campaign and the Battle of the Philippine Sea, undertook reconnaissance missions around Palau and Mindoro, and suffered losses during bombing raids staged from Morotai and Iwo Jima airfields. Elements were credited with interceptions against aircraft from carriers like USS Essex (CV-9), USS Lexington (CV-16), and USS Hornet (CV-12), while coordination attempts with units such as the 701st Naval Air Group and 342nd Kōkūtai were hampered by fuel shortages and attrition.
Commanding officers included senior aviators trained at the Naval Academy (Etajima) and promoted through postings at Kure Naval Base, with figures such as Tomonobu Imamura and Mitsuaki Imai noted in contemporary rosters and operational orders originating from the Imperial Japanese Navy General Staff Office. Senior pilots and warrant officers often had prior combat experience from campaigns like Guadalcanal Campaign and the New Guinea campaign, and technical staff were drawn from institutions like the Navy Aerotechnical Department and the Tokorozawa Army Aviation School transfers. Crew lists showed transfers from disbanded units including the 201st Kōkūtai and 252nd Kōkūtai, and personnel records reflected awards such as the Order of the Golden Kite nominations and citations within naval service decorations.
The kōkūtai staged from bases across the Philippines, Dutch East Indies, and the South China Sea arc, operating from airfields including Clark Air Base, Manila area airstrips, Sabang, Surabaya, and forward seaplane anchorages at Truk Lagoon and Rabaul. Rear-area support and overhaul occurred at facilities like Yokosuka Naval Arsenal, Sasebo Naval District, and Kamikawa Airfield, with temporary deployments to Morotai and Iwo Jima during crisis periods. Logistic constraints were exacerbated by Allied control of Leyte Gulf sea lanes and interdiction from B-29 Superfortress and B-24 Liberator bombing campaigns staged by U.S. Army Air Forces.
Postwar assessments of the 653rd appear in analyses by historians of the Pacific War, mentions in memoirs of commanders associated with the Combined Fleet, and records preserved in archives such as the Japan Center for Asian Historical Records and collections at the National Diet Library. The kōkūtai's operational record informs studies of late-war Japanese naval aviation tactics alongside examinations of units like the 343rd Kōkūtai and 201st Kōkūtai, and it is commemorated at regional memorials in former theaters including sites in the Philippines, Indonesia, and Palau where plaques, veterans' accounts, and unit histories are kept. Category:Imperial Japanese Navy Air Service