Lee flew to the UK on 23 May 1942 with the nine staff who would form the nucleus of his new command. He found that the commander of the United States Forces in the British Isles (USAFBI), Major General James E. Chaney, had prepared a different plan for the organization of the ETO headquarters, one along the orthodox lines laid out in the "Field Service Regulations", with Brigadier General Donald A. Davison designated to command the SOS. But Marshall had selected Lee, and he had mandated that the new theater organization should be "along the general pattern of a command post with a minimum of supply and administrative services." Somervell and Major General Dwight D. Eisenhower, the head of the Operations Division of the War Department General Staff, arrived in London on 26 May for discussions with Chaney about the organization of the ETO and the SOS. USAFBI officially became European Theater of Operations, United States Army (ETOUSA) on 8 June, and Chaney was replaced by Eisenhower on 24 June.