CISF is headed by an Indian Police Service officer with the rank of Director-General, assisted by an IPS officer in the rank of Addl. Director-General. The force is divided into Nine Sectors (Airport, North, North-East, East, West, South, Training, South-East, Central) and also has a Fire Service Wing. The Airport Sector is commanded by an IPS officer in the rank of Addl. Director-General, assisted by an Inspector-General. The Airport Sector is divided into a number of Field Formation Units, one for each airport. Units at major international airports are commanded by a Deputy Inspector-General or Commandant; units at smaller airports by a Deputy or Assistant Commandant. The other six Sectors are each commanded by an Inspector-General, who is assisted by a Deputy Inspector-General. The seven regional Sectors are divided into Zones, each commanded by a Deputy Inspector-General. Within each Zone are a number of Units, each under the command of a Commandant, or a DIG for certain major Units. A Deputy Commandant serves as the second-in-command of most units, or as the head of a smaller unit. Within the Training Sector, the National Industrial Security Academy (NISA) is headed by an Inspector-General; the Fire Service Training Institute (FSTI) and six other recruit training centres are headed by Deputy Inspectors General. The Financial Adviser of the CISF has been an Indian Revenue Service officer of the rank of Director and also has Dy Advisers from the Indian Audit and Accounts Service and Indian Civil Account Service. Rank structure (gazetted officers) Being a central Indian police agency and having high presence of Indian Police Service officers, CISF follows ranks and insignia similar to other police organisations in India. Non-gazetted (enrolled) officers and members use the same ranks as other Indian police forces. Officers Enlisted ranks CISF protection to Non-Nationalised Industry/ Corporate sector The Indian Parliament on 25 February 2009, authorised the provision of Central Industrial Security Force security to private and cooperative establishments across the country for a fee with the passage of the CISF (Amendment) Bill, 2008. The Bill, which was passed by Rajya Sabha on 19 February and Lok Sabha on 25 February 2009, also provides for deployment of CISF to protect Indian missions abroad and its participation in the UN peacekeeping operations. CISF started providing security to the Infosys Bangalore and Pune campus on 31 July 2009. The Infosys Mysore, the Reliance Jamnagar Refinery and the Delhi Metro Airport