The Fourth Air Army was a land-based aviation force of the Imperial Japanese Army. Formed in Rabaul in June 1943, consisting of the 6th and 7th Air Divisions. The air army was responsible for covering the Solomon Islands, Dutch New Guinea and the Territories of Papua and New Guinea areas of operations. The headquarters was at Rabaul. Disestablished in January 1945.

The 2nd Raiding Brigade, also known as the Takachiho Paratroopers, was an Imperial Japanese airborne forces unit. Part of the Imperial Japanese Army Air Service (IJAAS), the unit was notably involved in the Battle of the Philippines in 1945, during which it was almost completely destroyed.