A professional who operates cryptographic equipment to code, transmit, and decode secret messages for units of armed forces, law enforcement agencies, or business organizations. Responsibilities include:

• Selects required code according to instructions, using code book.
• Inserts specified code card into machine station to program encoding machine.
• Types plain text data on keyboard of automatic machine which encrypts and transmits message, or on semiautomatic machine which converts plain text into taped code for transmission via teletype machine.
• Feeds incoming tape into decoder device on semiautomatic machine and distributes decoded messages.
• Resolves garbled or undecipherable messages, using cryptographic procedures and equipment or requests retransmission of message.
• May operate teletype or teleprinter equipment to transmit messages.
• May operate radio to send and receive data.