The more mobile an armed force becomes, the more rugged the terrain it encounters, or the more widely the force is deployed, the greater becomes the difficulty of securing and maintaining rapid, completely linked communications. In the U.S. Army the Signal Corps is the agency charged with developing, procuring, and furnishing signal equipment to overcome the difficulties mentioned above. In an age of swift and startling progress in electronics, this phase of its mission demands that it keep abreast of scientific advances at home and abroad and maintain close ties with civilian laboratories...