The Royal Corps of Signals (often simply known as the Royal Signals - abbreviated to R SIGNALS) is one of the combat support arms of the British Army

British Army

The British Army is the land warfare branch of Her Majesty's Armed Forces in the United Kingdom. It came into being with the unification of the Kingdom of England and Scotland into the Kingdom of Great Britain in 1707. The new British Army incorporated Regiments that had already existed in England...

. Signals units are among the first into action, providing the battlefield communications and information systems essential to all operations.
Royal Signals units provide the full telecommunications infrastructure for the Army wherever they operate in the world.