[2] After attending the high school at Lincoln, Ingles enrolled at the University of Nebraska, where he studied electrical engineering.

[3] Many of his classmates became later general officers, including Carl A. Spaatz, Brehon B. Somervell, Frank W. Milburn, Harold R. Bull, John B. Anderson, Jens A. Doe, Orlando Ward, James L. Bradley, Vicente Lim, Ralph Royce, Harold Francis Loomis and Charles P.

After the war, the Signal Corps kept abreast of new technology and made first radar contact with the Earth's Moon during Project Diana and broke a speed record for fastest radioteletype in April 1945.

[9] Major general Harry C. Ingles retired from the Army in 1947 and subsequently was appointed a president of RCA Global Communications.

He is buried together with his wife Grace Salisbury Ingles (1889–1977) at Arlington National Cemetery, Virginia.