positions in Radio Central. The MAINCOMM Supervisor was also responsible to maintain discipline and leadership guidance for the Radiomen that worked under him/her, and would also submit evaluations on his crew to the chain of command. Facilities Control (FACCON) Supervisor:, Responsible for the supervision of the facilities control area. This supervisor, much alike the MAINCOMM supervisor, would do similar duties, but was responsible for the safe operation of shipboard electronic radio equipment and the associated peripheral equipment, such as quality monitoring systems as well as the maintenance and upkeep of the communications plan (COMPLAN) as well as the operational frequency board. Inbound/Outbound Traffic Checker:, Responsible for ensuring that all accountability of all message traffic reached appropriate designated departments as well as proper delivery of messages. This was generally considered a key position, but was often designated to junior Radiomen – particularly on board smaller vessels. On an aircraft carrier, this position was generally assigned to a second-class petty officer or below. Repro/Distro Operator:, Responsible for ensuring routed messages were appropriately slotted to the various departments shipboard. This position was generally assigned to paygrade E-3 and below personnel, where their technical prowess and accuracy of running off copies of messages were closely monitored by the MAINCOMM supervisor. CRYPTO Operator:, Responsible for ensuring that the cryptographic equipment was in good working order and that the appropriate keying material changes were made in a timely manner. This operator would often work with the Communications Security Material Systems (CMS) Custodian for key changeovers as well as inspections and inventory checks of cryptographic materials and associated electronic equipment. Teletype (TTY) Repairman:, Responsible for the maintenance and repair of teletype equipment on board ship as well as shore stations. This position required a high degree of mechanical dexterity with a limited knowledge of electricity and electronics. Typically, teletype repairmen, prior to attending TTY repair school in Norfolk, Virginia, had to take a basic course in electricity and electronics and pass it before being accepted on to TTY repair school. Inrouter: Responsible for ensuring that all inbound message traffic was properly routed to the various departments on board ship. Outrouter: Responsible for designating outbound messages serial numbers, date-time-group, and verification that messages were signed and released by appropriate officers with release authority. Also looked up and appended the routing for various addressees prior to transmission, until the advent of automated addressing, after which the only router was