 The ACS handled the radioteletype, radio telephone, 500 kHz ship-to-shore frequencies, collected communications intelligence, and other services for more than half a century in Alaska.The Army Signal Corps (which develops, tests, provides, and manages communications and information systems support for the command and control of all the U.S. armed forces) connected military posts with each other and with the rest of the continental United States.This system of thousands of miles of suspended landlines and submarine cable included the first successful long-distance radio operation in the world.