Inspector General (operations), is responsible for the planning and conduct of operations. Training is under another Inspector General (Training), located in Manesar, Gurgaon. They are further assisted by two DIGs – DIG (Operations) and DIG (Training). The strength of the NSG is estimated to be about 7000+ personnel. Air transport to support NSG is located at Indira Gandhi Airport. Special Action Group (SAG) There are 2 Special Action Groups – 51 and 52 SAGs. Both, along with 11 SRG, constitute the counter terrorist force (CTF) which is the counter-terrorist arm of NSG. 51 SAG along with 11 SRG are tasked for counter-terrorist and counter insurgency operations while 52 SAG deal with anti-hijacking operations. While SAG members are drawn from the Indian Army, SRG members are largely drawn from CAPFs. Special Ranger Group (SRG) There are 3 Special Ranger Groups (SRG) – 11,12 and 13. 11 SRG is under counter terrorist force (CTF) and is used purely for counter terrorist operations along with 51 SAG. SRG members are drawn both from the border guarding forces like BSF, ITBP and SSB and Internal Security Forces such as CRPF, CISF and Assam Rifles. In recent times GoI has decided to remove SRGs from protection duties and re-orient them exclusively for the mandate of NSG like SAG and 11 SRG. Special Composite Group (SCG) NSG has set five regional hubs under regional deployment. SCG consists of personnel both from Army and CAPFs for counter-terror operations within their area of responsibility. Each SCG is headed by an officer of rank colonel from the Indian Army on deputation as Group Commander. The five regional hubs are 26 SCG Mumbai 27 SCG Chennai 28 SCG Hyderabad 29 SCG Kolkata 30 SCG Gandhinagar Electronic Support Group (ESG) The electronic support group stationed at Manesar, provides communication and technological support. The group is headed by a Group Commander level officer on deputation. National Bomb Data Centre The National Bomb Data Centre (NBDC) was established in the year 1988 and redefined its role in the year 2000. NBDC was assigned the role of monitoring, recording and analyzing all bombing incidents in the country. It also records and analyses various bombing incidents across the world to gain expertise knowledge in bombing and related incidents to effectively counter such situations and shares information with relevant security agencies. NBDC also performs research and development in the field of explosives engineering. At present NBDC