Linux Disable Wireless Networking ( Wi-Fi )

in Categories CentOS, Debian / Ubuntu, Fedora Linux, Hardware, Linux, Networking, RedHat and Friends, Security, Troubleshooting, Wireless Networking last updated July 10, 2009

We have over 20+ Dell Precision M6400 laptops pre installed with Red Hat Enterprise Linux version 5.x. I was asked to disable Wi-Fi on all laptops as it poses a serious security risk to our sensitive (classified) systems and networks. How do I disable wireless networking (802.11) under Linux?