Cap badge, other ranks, Royal Signals, 1970 (c)

Anodised aluminium badge by J R Gaunt, London, with a figure of the Roman god Mercury above a scroll bearing the unit's motto, surmounted by a crown.

For many years, British Army units undertook their own signalling duties. The first professional body of signallers arose in 1870, when Captain Montague Lambert formed 'C' Telegraph Troop within the Royal Engineers. The Army's signallers only became a corps of their own in 1920, instantly gaining the 'Royal' prefix. The Royal Corps of Signals was assigned a place in the order of precedence between the Royal Engineers and the Foot Guards.

The badge of the Royal Corps of Signals depicts Mercury, the winged messenger of the gods, holding a caduceus (herald's staff) in his left hand, while balancing on a globe. In 1947, the motto of the Corps, 'Certa Cito', meaning 'Swift and Sure', was included in this new badge design.