Given the massive bureaucracy of the US military, security breaches are not surprising. They're still of concern, of course, as are their publication. I scanned the linked story and didn't find the actual URL, which is better, but I still believe that some things are better left unpublicized. People who may not have thought to look for such things are given ideas, and this story does provide some brief instructions on how to find information via FTP rather than HTTP (although, granted, this is relatively common knowledge).
Somehow, I just don't see our enemies publicizing their particular weaknesses via the newswires.