Pradesh, which supplies tear gas and smoke shells for riot prevention to all state police forces. It operates dog squads, and runs the National Dog Training and Research Centre. The BSF, one of several Indian police forces which have its own air and water wings, provides helicopter, dog and other support services to the state police. Central Industrial Security Force The Central Industrial Security Force's (CISF) primary task is to provide industrial security. It guards industrial installations nationwide which are owned by the central government, secures seaports and airports, and provides security for certain non-governmental organizations. The CISF provides security for nuclear-power plants, space installations, mints, oil fields and refineries, heavy-engineering and steel plants, barrages, fertilizer units, hydroelectric and thermal power stations, and other installations partially (or wholly) run by the government. Central Reserve Police Force The Central Reserve Police Force's (CRPF) main objective is to assist states and union territories' law-enforcement agencies in maintaining law and order and containing insurgency. It is deployed as an anti-terrorist unit in several regions, and operates abroad as part of United Nations peacekeeping missions. Indo-Tibetan Border Police The 90,000-member Indo-Tibetan Border Police (ITBP) is responsible for security along the Indo-Tibetan border and its surrounding areas. ITBP personnel are trained in maintaining law and order, military tactics, jungle warfare, counter-insurgency, and internal security. National Security Guard The National Security Guard (NSG) is a commando unit originally created for counter-terrorism and hostage-rescue missions. Founded in 1986, it is popularly known as the "Black Cats" for its uniform. Like most military and elite-security units in India, it avoids the media and the Indian public is largely unaware of its capabilities and operational details. The NSG draws its core members from the Indian Army, and the balance is support staff from other central police units. An NSG team and a transport aircraft is stationed at Indira Gandhi International Airport in New Delhi, ready to deploy in 30 minutes. Sashastra Seema Bal Sashastra Seema Bal (SSB), founded in 1963, is deployed at the Indo-Nepal and Indo-Bhutan borders. SSB, with over 82,000 personnel, is trained in maintaining law and order, military tactics, jungle warfare, counter-insurgency, and internal security. Its personnel are also deployed to the Intelligence Bureau (IB), Research and Analysis Wing (R&AW), Special Protection Group (SPG), National Security Guard. Officers begin as an assistant commandant (equivalent to deputy superintendent of police on a state force), and retire with the rank of inspector general (IG). Special Protection Group The Special Protection Group (SPG), the central government's executive protection agency, is responsible for the protection of the Prime Minister of India and their immediate family. The force was established in 1985, after the assassination of Indira Gandhi. It provides daily, round-the-clock security throughout India to the present Prime Minister and his family. Central investigation and intelligence institutions Central Bureau of Investigation The Central Bureau of Investigation (CBI) is India's premier investigative agency, responsible for a wide variety of criminal and national security matters. Often cited as established with the Delhi Special Police Establishment Act, 1946, it was formed by the central government (which controls the Delhi police) with a resolution. Its constitutionality was questioned in the Gauhati High Court Narendra Kumar vs Union of India case on the basis that all areas of policing are exclusive to state governments, and the CBI is a central-government agency. The court ruled that despite the lack of legislation, the CBI is an authorized agency of the central government for national policing. Its ruling was upheld by the Supreme Court of India, which cited the CBI's national importance. The bureau is controlled by the