[Footnote 5-45: Memo, CofS, ASF, for Dir, Special Planning Division, WDSS, 1 Oct 45, sub: Participation of Negro Troops in the Postwar Military Establishment, WDSSP 291.2 (2 Oct 45). On the use of Negroes in the Signal Corps, see the following volumes in the United States Army in World War II series: Dulany Terrett, _The Signal Corps: The Emergency_ (Washington: Government Printing Office, 1956); George Raynor Thompson et al., _The Signal Corps: The Test_ (Washington: Government Printing Office, 1957); George Raynor Thompson and Dixie R. Harris, _The Signal Corps: The Outcome_ (Washington: Government Printing Office, 1966).] The Army Ground Forces, which trained black units for all major branches of the field forces, also wanted to retain black units, but its report concluded that these units could be of battalion size. The organization of black soldiers in division-size units, it claimed, only complicated the problem of training because of the difficulty in developing the qualified black technicians, noncommissioned officers, and field grade officers necessary for such large units and finding training locations as well as assignment areas with sufficient off-base recreational facilities for large groups of black soldiers. The Army Ground Forces considered the problem of finding and training field grade officers particularly acute since black units employing black officers, at least in the case of infantry, had proved ineffective. Yet white officers put in command of black troops felt they were being punished, and their presence added to the frustration of the blacks.