New NATO structures were also formed while old ones were abolished. In 1997, NATO reached agreement on a significant downsizing of its command structure from 65 headquarters to 20. The NATO Response Force (NRF) was launched at the 2002 Prague summit on 21 November, the first summit in a former Comecon country. On 19 June 2003, a further restructuring of the NATO military commands began as the Headquarters of the Supreme Allied Commander, Atlantic were abolished and a new command, Allied Command Transformation (ACT), was established in Norfolk, Virginia, United States, and the Supreme Headquarters Allied Powers Europe (SHAPE) became the Headquarters of Allied Command Operations (ACO). ACT is responsible for driving transformation (future capabilities) in NATO while ACO is responsible for current operations. In March 2004, NATO's Baltic Air Policing began, which supported the sovereignty of Latvia, Lithuania, and Estonia by providing jet fighters to react to any unwanted aerial intrusions. Eight multinational jet fighters are based in Lithuania, the number of which was increased from four in 2014. Also at the 2004 Istanbul summit, NATO launched the Istanbul Cooperation Initiative with four Persian Gulf nations.