One of MacArthur's first orders to Brett was for a bombing mission to the Philippines, an order delivered personally by Sutherland. When Brett protested, Sutherland informed him that MacArthur wanted the mission carried out. The mission was flown by Brigadier General Ralph Royce, but MacArthur personally wrote a reprimand to Brett. Henceforth, communications with Sutherland were handled by Bostock. Further disagreements between MacArthur and Brett followed. Meanwhile, in Washington, General George Marshall and the Chief of Army Air Forces, Lieutenant General Henry Arnold, had become alarmed at Brett's integration of the USAAF and RAAF, and disturbed by his inability to work with MacArthur. On 6 July 1942 Marshall radioed MacArthur to offer him Major General George Kenney or Brigadier General Jimmy Doolittle as a replacement for Brett; MacArthur selected Kenney.