Disable Bluetooth

Hi, I am successfully building images through InstaDMG and have incorporated the firstboot script package into the workflow, oddly on each image built, Bluetooth is always on and shown in the menu bar, I don't mind it in the bar but how do you script to turn it off. In the firstboot.sh script I have tried [code]$networksetup -setnetworkserviceenabled 'Bluetooth DUN' off[/code] but it doesn't do the trick - any thoughts?