The was a combat aviation unit of the Imperial Japanese Navy Air Service (IJNAS) during the Pacific Campaign of World War II. History The 25th Air Flotilla, mainly consisting of land-based bombers, fighters, and reconnaissance aircraft, reported to the 11th Air Fleet. As originally organized, the flotilla's core units were the 4th Air Group, Tainan Air Group, and Yokohama Air Group. The 4th flew bombers, the Tainan fighters, and the Yokohama reconnaissance aircraft. The flotilla, under the command of Rear Admiral Sadayoshi Yamada, was deployed to Rabaul, New Britain on 29 March 1942. From this location, the unit supported Japanese military operations in the New Guinea and Solomon Islands Campaigns. During these campaigns, the unit was augmented by aircraft from other flotillas (i.e., 2nd Air Group and 3rd Air Group). The operational title for this hybrid organization was the 5th Air Attack Force. The organization took heavy losses in air combat over Guadalcanal. Organization Commanding officers References Footnotes Citations Bibliography Monthly "The Maru" series, and "The Maru Special" series, (Japan) "Ships of the World" series, (Japan) "Famous Airplanes of the World" series and "Monthly Kōku Fan" series, Bunrindō (Japan) Units of the Imperial Japanese Navy Air Service Military units and formations established in 1942 Military units and formations disestablished in 1944 Military units and formations established in 1944 Military units and formations disestablished in 1945