This volume investigates the organizational and technological evolution of the United States Army Signal Corps during the critical period of pre-war mobilization leading up to December 1941. Dulany Terrett, writing as part of the official U.S. Army historical series, examines how the Signal Corps transitioned from a small, peacetime organization to a vital component of a rapidly expanding military force. The text analyzes the administrative challenges, procurement hurdles, and the integration of emerging radio and radar technologies required to support a global conflict.

Historians and military researchers regard this work as a foundational primary source for understanding the institutional history of the U.S. Army Signal Corps. Readers frequently note the academic density of the prose and the exhaustive reliance on official government records and internal correspondence.