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The Republican Security Forces (RSF) were a parallel version of UNIT on Earth in a parallel universe. They were stationed at the Inferno Project. (TV: Inferno)

The RSF was founded in 1959 by Major James Lethbridge-Stewart and Captain Marianne Kyle. (PROSE: The Schizoid Earth) Shortly after its establishment they battled the Bannermen in Wales, from whom they obtained artificial gravity and fast drive technology. (PROSE: The Face of the Enemy)

Over the 1960s the RSF fought many alien threats under the leadership of James Lethbridge-Stewart, including the Great Intelligence and the Axons, however the RSF could not avoid being drawn under the control of James' power hungry father, Gordon Lethbridge-Stewart. By the end of the 1960s Gordon had taken the reigns of power and alienated James through his ultranationalist policies. James fled to another Earth using technology stolen from the Axons. (PROSE: Night of the Intelligence)