These are the guys in uniform, who you see at secuirity check points at the airport - everytime you take a domestic or an international flight. They are the ones, who frisk you, check your baggage on the x-ray machine, and politely ask you to remove your lighter or batteries from your cabin baggage.
They are also the soldiers in uniform who guard the Delhi Metro. You will see them manning all security check points at the Metro stations. You encounter them for maybe five seconds - occasionally they may have frisked you, and you are on your way.
What you probably might not know is that the Central Industrial Security Force, established in 1969 with the primary objective to provide security to Public Sector Undertakings in India has, over the years become a premier multi-skilled security agency of the country, mandated to provide security to major critical infrastructure installations of the country in diverse areas. CISF is currently providing security cover to nuclear installations, space establishments, airports, seaports, power plants, sensitive Government buildings and ever heritage monuments. What is a matter of pride for the force is that it has played the role of a consultant in security matters, to the private sector has also.
These are the guys who aren't the normal 'cops' - you wouldn't have seen them behave like the local police.Instead, they go about performing their job with cool and calm efficiency, amidst tremendous pressure of all kinds - huge amounts of traffic in terms of incoming and outgoing passengers, and the ever lasting threat of a terror incident.
The next time you undertake a journey by the Metro in Delhi, or by air, remember - that it is the CISF that makes travel safe for you - always and every time.