Western governments were prompted to form specialist anti-terrorist units following the " Munich massacre " . During the 1972 Olympic Games , a firefight between a group of hostage-takers and West German police left a police officer and all the hostages dead . The British government , worried that the country was unprepared for a similar crisis in the United Kingdom , ordered the formation of the Counter Revolutionary Warfare ( CRW ) Wing of the SAS , which became the UK 's primary anti-terrorist and anti-hijacking unit
Munich massacre
Munich massacre
Iranian Embassy siege