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==