Since its establishment in 2000, the chairperson of the NCA has been the Prime Minister of Pakistan. The NCA supervises and forms a tight control of the strategic organisations related to the research and development in Weapons of Mass Destruction (WMD). Pakistan has an extremely strict command and control system over its strategic assets, which is based on C4ISTAR (Command, Control, Communications, and Computing of Intelligence, Surveillance, Target Acquisition, and Reconnaissance) which is kept under the Air Force. The Islamabad-based Strategic Force Organization (SFO) has a three-tier system which forms by combining the Nuclear Command Authority, Strategic Plans Division Force (SPD Force), and each of three Inter-Services strategic force commands. The SPD's own force called SPD Force is responsible for security of nuclear weapons while the strategic forces commands of the air force, army, and navy exercise the deployments and eventual usage of the WMDs. However, the executive decisions, operational plannings, and controls over the WMDs remains vested with the NCA under the Prime Minister of Pakistan.