While AirDrop allows us to easily move files from machine to machine it can also be seen as a security risk in certain environments. In order to disable the service you need to add a key to the NetworkBrowser plist file, this is easy to do with the Defaults command.
defaults write /System/Library/User Template/English.lproj/Library/Preferences/com.apple.NetworkBrowser.plist DisableAirDrop -bool YES