Finally, the controller of each net has the call sign 0 "zero". There may also be a second controller - either a backup station or a commander who has delegated communication tasks to a signaller but may occasionally wish to speak in person - using the call sign 0A "zero alpha".
Due to the predictable nature of some of these, such as "SHELLDRAKE", all but SUNRAY and MINOR were removed from use in the British Army.
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