 Complete the following phrase:  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 