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In the armed forces, a signaller or signaleer is a specialist soldier or seaman or airman responsible for military communications. Signallers, aka Combat Signallers or signalmen or women, are commonly employed as radio or telephone operators, relaying messages for field commanders at the front line (Army units, Ships or Aircraft), through a chain of command which includes Field headquarters and ultimately governments and non government organisations. Messages are transmitted and received via a communications infrastructure comprising fixed and mobile installations.
Modern signallers are responsible for the battlefield voice and data communication and information technology infrastructure, using a variety of media. All types of wire (line), satellite and ionospheric radio communication are employed. These include common radio systems such as HF/VHF radio and UHF/SHF radio (operated in line of sight, for example). Cellular radio and telephone systems such as TETRA are also becoming common.
In addition to day-to-day soldiering, the signaller is required to be competent at a number of skill levels in the following topics:
- Maintaining Power Supplies (Batteries and Charging for example)
- Radio sets; storage and logistics; installation and operation; maintenance and repair at unit level.
- Station Organisation; Managing Radio Nets and Maintaining Net Discipline for example, map marking, log keeping etc.
- Voice and wireless telegraphy procedure (using Morse code or RATT (Radio assisted Teletype) for example). Formal message procedure, electronic mail.
- Electronic Warfare (EW); Communications Security (COMSEC) - including the encryption and deciphering of coded messages using paper/voice and electronic codes for example.
- Telephone and Line
- Information and Communication Technology
- Antennae selection and design
In an air force, a signaller, an aircrew member, is a person trained to communicate between the aircraft, its base and units in the area of operation, by means of radio or other digital communications.
In the British Army, signaller may refer to a member of the Royal Corps of Signals specifically to the rank of Signaller (formerly Signalman) or a trained signals specialist in other areas of the army such as the Infantry or Royal Artillery.
In the Australian Army, a signaller is often referred derogatorily to as a Chook (Australian Slang for Chicken) by soldiers outside the Signal Corps, because the Morse code used by Signallers has been likened to the chirping of chickens.
In the Canadian Army, a signaller is often referred to as a "Jimmy" in reference to the flag and cap badge feature Mercury (Latin: Mercurius), the winged messenger of the gods, who is referred to by members of the corps as "Jimmy". The origins of this nickname are unclear. According to one explanation, the badge is referred to as "Jimmy" because the image of Mercury was based on the late medieval bronze statue by the Italian sculptor Giambologna, and shortening over time reduced the name Giambologna to "Jimmy". The most widely accepted theory of where the name Jimmy comes from is a Royal Signals boxer, called Jimmy Emblem, who was the British Army Champion in 1924 and represented the Royal Corps of Signals from 1921 to 1924. The picture of Mercury (Greek: Hermes), the Roman messenger of the gods, which is referred to as Jimmy.
Signallers in Canada are responsible for the majority of radio, satellite, telephone, and computer communications within the Canadian military. Trained signallers of the rank of private in Canada are referred to as "Sig" as a replacement for private (i.e. Sig Smith).
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