The Genzan Air Group was founded on 15 November 1940 at Genzan, Korea, then a part of the Empire of Japan. It was initially a mixed-unit equipped with 33 Type 96 Mitsubishi G3M1 bombers and 25 Type 96 Mitsubishi A5M4 fighters under the command of the Second Air Fleet. On January 15, 1941, it was reassigned to the 22nd Kōkū Sentai and deployed to Hankou in central China.

Operations in China edit

While based at Hankou, the bombers of the Genzan Air Group were primarily assigned to strategic bombing missions in Sichuan Province, while the fighters were assigned to combat air patrol and ground support missions in support of Imperial Japanese Army operations. The Genzan Air Group was withdrawn from China in September, 1941, returning to its home base at Genzan for training, and at the end of October, 1941 was forward deployed to Takao in Taiwan.

With the bombing of Pearl Harbor and the outbreak of the Pacific War, the Genzan Air Group was deployed to Saigon, French Indochina. The group was a key participant in the sinking of the British capital ships HMS Prince of Wales (53) and HMS Repulse (1916) off the coast of Malaya on 10 December 1941, losing one aircraft and its crew during the battle.

On January 22, 1942, bombers from the Genzan Air Group attacked Kallang Airport in Singapore, and subsequently provided air support for Japanese offensives in Malaya including the landings at Endau. At the end of February, the unit was transferred to Bangkok and assigned to patrols over the Indian Ocean; however, facilities at Bangkok were not satisfactory and the unit was soon reassigned to Palembang in Sumatra in the Netherlands East Indies, with some aircraft dispersed to Kuching in Sarawak.

On May 1, 1942, Genzan's flying unit was redeployed to Rabaul, New Britain to support the Japanese campaign in New Guinea. The group participated in the Battle of the Coral Sea, without success, and made numerous bombing attacks against Port Moresby.

In July, after the cancellation of Operation Mo, the unit was withdrawn to Japan and was based at Misawa, Aomori for training. Its fighter unit was detached and redesignated as the 252 Kōkūtai in September. The Genzan's flying unit was disbanded by being redesignated as the 755 Kōkūtai on 1 November 1942.

Commanding Officers edit

• Capt. Izawa Ishinosuke (43) - 15 November 1940 - 1 October 1941
• Cdr. / Capt. Maeda Takanari (47) – 1 October 1941 – 20 September 1942 (Promoted Captain on 15 October 1941.)
• Cdr. Yamashita Sakae (49) – 20 September 1942 – 1 November 1942

Executive Officers edit

• Cdr. Minematsu Iwao (48) – 15 November 1940 – 10 October 1941
• VACANT – 10 October 1941 – 1 November 1942

Maintenance Officers edit

• LtCdr. (Eng.) Hata Nobukuma (Eng. 31) – 15 November 1940 – 1 September 1941
• LtCdr. (Eng.) Azuma Tetsuo (Eng. 33) – 1 September 1941 – 25 September 1942
• Lt. (Eng.) Kataoka Shoichi (Eng. 42) – 25 September 1942 – 1 November 1942

Surgeons edit

• LtCdr. (Med.) Masuoka Satoru (1927) - 15 November 1940 – 10 April 1942
• LtCdr. (Med.) Takeyasu Sueharu (1930) – 10 April 1942 – 13 October 1942
• LtCdr. (Med.) Suzuki Keiichiro (1928) – 13 October 1942 – 1 November 1942

Paymasters edit

• LtCdr. (Pay.) Kishida Mizunari (Pay. 16) – 15 November 1940 – 20 September 1941
• Lt. (Pay.) Sudo Hiroshi (Pay. 24) – 20 September 1941 – 5 August 1942
• Lt. (Pay.) Nagai Hora (Pay. Aux. 2) – 5 August 1942 – 1 November 1942

Communications Officers edit

• LtCdr. Ikeda Iwao (55) – 15 November 1940 – 15 September 1941
• LtCdr. Minekawa Minoru (57) – 15 September 1941 – 1 November 1942

Air Officers edit

• Cdr. Asada Masahiko (52) – 15 November 1940 – 1 September 1941
• LtCdr. Sonokawa Kameo (52) – 1 September 1941 – 1 April 1942
• LtCdr. Tokoro Shigehachiro (51) – 1 April 1942 – 1 November 1942

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