GROUND ZERO Chairman of the Joint Chiefs of Staff U.S. Navy Adm. Mike Mullen is given an overview of the Ground Zero construction by Port Authority Police Inspector Susan Durrett in New York City, Sept. 12, 2008. Mullen toured the 9/11 crash site the day after giving a speech during the Pentagon Memorial Dedication in Washington, D.C., for 9/11 victims. SHARE IMAGE: Download Image: Full Size (0.08 MB) Photo By: VIRIN: 425998-K-TYH00-533.jpg Photo Gallery