The regiment formed a key element of the security force in place for the Sydney Olympic Games in 2000, and in the lead-up to the event the regiment underwent a period of modernisation, acquiring new equipment and capabilities, including the ability to respond to chemical, biological and radiological threats, as well as developing techniques for the clandestine boarding of moving ships at night. During the Games two SASR squadrons were available for counter-terrorist operations, with one designated to respond to incidents in Sydney and Canberra, while the other was on standby for incidents elsewhere. Defence involvement in domestic security increased after the terrorist attacks in the United States on 11 September 2001, and the unit has since formed part of the security force for a range of international sporting and political events held in Australia, including the Commonwealth Heads of Government Meeting at Coolum, Queensland in March 2002, and the visit of US President George W. Bush to Canberra in October 2003. The SASR maintains TAG (West) to respond to incidents on the west coast of Australia. It also provided the training and use of their facilities to raise a second Tactical Assault Group in the 2nd Commando Regiment.