This book traces the history of the U.S. Army Signal Corps from its beginnings on the eve of the American Civil War through its participation in the Persian Gulf conflict during the early 1990s. Over the course of its 135 years of existence, the Signal Corps has often been at the forefront of the revolutionary changes that have taken place in communications technology. It contributed significantly, for example, to the development of radar and the transistor. In today's information age, the Signal Corps continues its tradition of leadership and innovation on the digitized battlefields of the twenty-first century. While accounts of the branch's service during the Civil War, World War II, and Vietnam have been published, little has been written about the rest of the Signal Corps' accomplishments. This book fills out the picture. It shows today's signal soldiers where their branch has been and points the way to where it is going. The reader, whether military or civilian, can follow the growth and development of one of the Army's most sophisticated technical branches. By telling the Signal Corps' story in a comprehensive manner, this volume makes a significant contribution to the history of the Army. Douglas D. Buchholz John W. Mountcastle Major General, USA Brigadier General, USA Chief of Signal Chief of Military History