Intrusion Counter-Measures Group

Intrusion Countermeasures Group or ICMG was a secret arm of the British military which acted as a predecessor to UNIT, intended to take action against covert threats to British soil. It operated during the 1960s.

History
The ICMG was formed in 1961 under the command of Group Captain Ian Gilmore. He drafted scientific specialists like scientist Rachel Jensen under the Peacetime Emergency Powers Act. The Intrusion Countermeasures Group was composed of Royal Air Force personnel and equipment. (MA: Who Killed Kennedy)

At 76 Totter's Lane in November 1963, the group encountered the Seventh Doctor and Ace, whom its members later assisted in defeating both the Renegade and Imperial Dalek factions who were searching for the Hand of Omega. This event became known as the Shoreditch Incident. (DW: Remembrance of the Daleks)

After working with Counter-Measures once again as a consultant, the organisation's former scientific adviser Professor Rachel Jensen accepted the offer of Sir Toby Kinsella to join it permanently - on the condition that she was supplied with the facilities to continue her research on site and that she would replace Gilmore as its leader. However, she assured him that she would defer to his judgement in all matters of security. (CM: Threshold) While Gilmore was initially bitter that Rachel had replaced him, he eventually came to respect her not only as a scientist but as his superior officer as well. (CM: Artificial Intelligence)

Counter-Measures was shut down at some point prior to the formation of a replacement organisation, the United Nations Intelligence Taskforce, in the late 1960s. In the early 1970s, James Stevens attempted to investigate and make public information concerning this group, as well as UNIT, but was stymied in doing so. (MA: Who Killed Kennedy)