Clansman is the name of a combat net radio system (CNR) used by the British Army from 1976 to 2010. Clansman was developed by the Signals Research and Development Establishment (SRDE) in the 1960s, to satisfy a General Staff Requirement (GSR) laid down in 1965. Clansman represented a considerable advance over existing Larkspur radio system, and proved to be more flexible, reliable and far lighter. The technological advances in the design of Clansman allowed the introduction of Single SideBand (SSB) operation and NarrowBand Frequency Modulation (NBFM) to forward area combat net radio for the first time.