How exactly did ABC news "obtain" a document about top secret military activities? Was it declassified?
It is a captured document, thus is not considered classified in and of itsself. The capture of it could be made classified, however the announcement of the capture can be made at the descresion of the US military command.
It is an official release via the news media.
and it is good psychological warfare. It shows that Zarqawi does not have anywhere that is safe to operate out of as a headquarters. He has to keep moving. It also shows that more folks are turning on him by providing the intel leads.