These are some photos I scanned years ago from various Signal Corps books.
United States Army in World War II: The Technical Services. The Signal Corps: The Test (December 1941 to July 1943) By: George Raynor Thompson, Dixie R. Harris, Pauline M. Oakes, Dulany Terret. Office of the Chief of Military History, Dept. of the Army, Washington, D.C., 1957
United States Army in World War II The Technical Services The Signal Corps: The Outcome (Mid-1943 Through 1945) by George Raynor Thompson and Dixie R. Harris. Office of the Chief of Military History United States Army, Washington, D.C., 1966
Getting the Message Through: A Branch History of the US Army Signal Corps. By Rebecca Robbins Raines
Center of Military History, United States Army Washington, D.C., 1996.
