Construction Division From 4 September 1939 to 19 June 1940, Styer was a student at the
Army Industrial College. He became the commanding officer of the
8th Engineer Squadron at
Fort McIntosh, Texas, from 3 August to 24 November 1940, and was executive officer of the Engineer Replacement Center at Fort Humphreys and
Fort Leonard Wood, Missouri. On 12 December 1940, he was assigned to the Construction Division in the Office of the
Quartermaster General. The US Army was about to embark on a national mobilization, and it was the task of the Construction Division to prepare the necessary accommodations and training facilities for the vast army that would be created. This enormous construction program had been dogged by bottlenecks, shortages, delays, spiralling costs, and poor living conditions at the construction sites, and newspapers published accounts charging it with incompetence, ineptitude, and inefficiency. A new head, Colonel
Brehon B. Somervell, took over the Construction Division on 12 December 1940, and four days later Somervell reorganized it, bringing Styer in as his deputy, and replacing all but two of the Construction Division's branch heads, one of the exceptions being Colonel
Leslie R. Groves, Jr. One of Styer's tasks was finding talented officers to work on construction projects. His appeal to the Chief of Engineers released three officers, including Major
Hugh J. Casey and Captains Edmund K. Daley and
Garrison H. Davidson. By December 1941, 375 projects had been completed and 320 were still under way, with a total value of $1.8 billion. On 16 December 1941, the Construction Division was transferred from the
Quartermaster Corps to the Corps of Engineers. Styer, who had been promoted to
colonel on 8 April 1941, drew up the plan for the transfer and the new organization, in which he remained the deputy head. He was awarded the
Army Distinguished Service Medal for his services.
Army Service Forces On 5 February 1942, the
Chief of Staff of the United States Army,
General George C. Marshall, announced that he was considering a radical reorganization of the
War Department, and gave his staff 48 hours to comment on the proposals. Somervell, now the Assistant Chief of Staff, G-4, and Styer drew up a plan for a new, overarching logistics command initially known as the
Services of Supply. Their proposal was accepted, and the new command was created on 28 February 1942. It was renamed the Army Service Forces in March 1943, as the term "supply" was felt to be too narrow a description of the broad range of logistical activities carried out by the organization. Somervell became its commander, and Styer his chief of staff from 9 March 1942. Styer was promoted to
brigadier general the next day, and
major general on 8 August 1942. He became deputy commanding general of the Army Service Forces on 13 August 1943. In September 1942, the director of the
Office of Scientific Research and Development (OSRD),
Vannevar Bush, suggested Styer be appointed director of the
Manhattan Project, but Somervell did not wish to lose his services, and engineered the appointment of Groves instead. On 23 September 1942, Styer became a member of the Military Policy Committee, a group chaired by Bush (with
James B. Conant as his alternate) with Rear Admiral
William R. Purnell as its third member. As director, Groves was answerable to the Military Policy Committee, which was responsible for the higher direction of the Manhattan Project. When the Combined Policy Committee was formed in September 1943 by the
Quebec Agreement, its chairman,
Secretary of War Henry Stimson, had Styer appointed as his deputy. Styer also became chairman of its technical subcommittee, which included America's
Richard Tolman, Britain's
James Chadwick and Canada's
C. J. Mackenzie. The technical subcommittee became very influential, as it furnished most of the data on which the Combined Policy Committee based its decisions.
Robert P. Patterson and U. S. High Commissioner to the Philippines Paul V. McNutt in McNutt's office in Manila in 1946 Styer was not confined to his office. In 1943, Somervell sent him to the
China Burma India Theater to report on the
Ledo Road. Styer's report persuaded the
Combined Chiefs of Staff to allocate the required personnel, equipment and supplies to develop the road. He was promoted to
lieutenant general on 7 November 1944.
Army Forces, Western Pacific In April 1945, Somervell sent him to the Philippines to report on preparations for
Operation Downfall, the invasion of Japan. The
Supreme Allied Commander in the
South West Pacific,
General of the Army Douglas MacArthur, asked Styer to become head of a logistics organisation for Operation Downfall. Styer accepted the offer, but when he returned in May 1945 to assume the post, he found it was not what he had accepted. Instead, he became the commanding general of Army Forces, Western Pacific, a command co-equal with Lieutenant General
Robert C. Richardson, Jr.'s Army Forces, Middle Pacific, which included logistical units, but also combat forces, while the planning responsibilities remained with MacArthur's General Headquarters. On 24 September 1945, with the war over, MacArthur ordered Styer "to appoint
military commissions for the trial of such persons accused of war crimes". To try General
Tomoyuki Yamashita, Styer appointed a commission of five general officers: Major Generals
Russel B. Reynolds, Leo Donovan and
James A. Lester, and Brigadier Generals Morris C. Harwerk and Egbert F. Bullens. Styer had the authority to reduce the sentence handed down by the commission, but he upheld the commission's death sentence on 12 December. The sentence was upheld by the
Supreme Court of the United States. ==Later life==