CTs control the flow of messages and information. Their work depends on their special career area: administration (CTA) - administrative and clerical duties that control access to classified material; interpretive (CTI) - radiotelephone communications and foreign language translation; maintenance (CTM)- the installation, servicing and repair of electronic and electromechanical equipment; communication (CTO) - operation of telecommunications systems, and AIS networking and information management; collection (CTR) - Morse code communications and operation of radio direction-finding equipment; and technical (CTT) - communications by means other than Morse code and electronic countermeasures.
CT Communication Technician (1948-1976) CT Cryptologic Technician (1976-