DCA's first major tasks were to identify the DCS elements and develop an implementation and management plan. The DCS was essentially a collection of communications systems turned over by the military departments with considerable restrictions. Key among these responsibilities was the establishment of three common-user, defense-wide networks that would be known as the Automatic Voice Network (AUTOVON), the Automatic Digital Network (AUTODIN), and the Automatic Secure Voice Communications Network (AUTOSEVOCOM). For each, DCA sought to determine its overall system configuration and prepare the technical specifications necessary for the equipment for switching centers, interconnecting transmission media, and subscriber terminals.