are trained in maintaining law and order, military tactics, jungle warfare, counter-insurgency, and internal security. They were also deployed to Indian diplomatic missions located in Afghanistan. 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