How is a video from a helicopter showing the pilots gunning down reporters and civilians "pertinent to national security," and why was it classified, other than to hide a crime?
By showing when where and how American troops
are WERE operating in a war zone, you endanger other soldiers operating in that war zone.
That said, he released
a few hundred thousand classified documents, not just a video on an airstrike.
The War logs stopped before the release: last War log in December 2009, release in October 2010