The National Security Guard (NSG) was set up in 1984 as a Federal Contingency Deployment Force to tackle all facets of terrorism in the country. Thus the primary role of this Force is to combat terrorism in whatever form it may assume in areas where activity of terrorists assumes serious proportions, and the State Police and other Central Police Forces cannot cope up with the situation. The NSG is a Force specially equipped and trained to deal with specific situations and is therefore, to be used only in exceptional situations. The Force is not designed to undertake the functions of the State Police Forces or other Para Military Forces of the Union of India.
The NSG was modelled on the pattern of the SAS of the UK and GSG-9 of Germany. It is a task-oriented Force and has two complementary elements in the form of the Special Action Group (SAG) comprising Army personnel and the Special Ranger Groups (SRG), comprising personnel drawn from the Central Para Military Forces / State Police Force. All the personnel are on deputation.