Kenney read this Ultra intelligence in the office of the Supreme Allied Commander, South West Pacific Area – General Douglas MacArthur – on 25 February. The prospect of an additional 6,900 Japanese troops in the Lae area greatly disturbed MacArthur, as they might seriously affect his plans to capture and develop the area. Kenney wrote out orders, which were sent by courier, for Brigadier General Ennis Whitehead, the deputy commander of the Fifth Air Force, and the commander of its Advance Echelon (ADVON) in New Guinea. Under the Fifth Air Force's unusual command arrangements, Whitehead controlled the Allied Air Forces units of all types in New Guinea. This included the RAAF units there, which were grouped as No. 9 Operational Group RAAF, under the command of Air Commodore Joe Hewitt.