An IAF Mi-17 helicopter crashed in Coonoor, Tamil Nadu, in which CDS General Bipin Rawat and his wife were also present. So far more than 11 people have died. Let us tell you that the army helicopter that crashed in Coonoor, Tamil Nadu was not an ordinary helicopter. That was the Mi-17V-5 helicopter, which is considered to be highly advanced for military use, which is also used for troop and arms transport, fire support, escort, patrolling, and search-and-rescue (SAR) missions. It is used by many VVIPs in India. In a special conversation with Aaj Tak, Defense Expert told that what are the security-related preparations done before the VVIP movement till helicopter? Watch this video for information.