On November 15, 1940 formed as the Genzan Kōkūtai (Genzan Air Group) 元山海軍航空隊 in Genzan (Wonsan) in Korea. Fighters used identificaton symbol "カ". Bombers used "G-XXX" for tail codes.
At the start of the Pacific War, Genzan Kokutai deployed to Saigon in French Indochina.
On December 10, 1941 G3M Nells participated in the sinking of the HMS Prince of Wales (53) and HMS Repulse losing one aircraft and its crew.
On January 22, 1942, G3M Nells bombed Kallang Airport on Singapore. Afterwards, provided air support for Japanese offensives in Malaya including the landings at Endau.
At the end of February 1942, the unit was transferred to Bangkok and assigned to patrols over the Indian Ocean. Facilities at Bangkok were not satisfactory and the unit was soon reassigned to Palembang Airfield on Sumatra, with some aircraft dispersed to Kuching in Sarawak.
On May 1 1942, Genzan deployed to Rabaul to support the Japanese campaign in New Guinea and the Solomon Islands. The group participated in the Battle of the Coral Sea and the bombing campaign against Port Moresby.
During July, after the cancellation of Operation MO, the unit was withdrawn to Japan and was based at Misawa Airfield for training.
On September 20, 1942 the Genzan Kokutai figher butai of 36 A6M Zeros was expanded to 60 Zeros and redesignated as the 252 Kōkūtai (252 Ku).
On November 1, 1942 the Imperial Japanese Navy (IJN) renamed air groups with three digit identifiers. The Genzan Kokutai bomber unit was redesignated 755 Kōkūtai (755 Air Group).
The group used different codes at various dates with three digit aircraft codes for each aircraft.
カ-??? (fighter tail code) - 1940
G-??? (bomber tail code) – 1940
Kodochosho Genzan Kōkūtai
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