US Navy (USN) Admiral William J. Fallon (foreground left) Commander, US Pacific Command (USPACCOM), issues the Oath of Re-enlistment to 14 USN Sailors at"Ground Zero"the site of the World Trade Center attack in New York City, during Fleet Week New York 2006. Fleet Week is New York's celebration of the sea services honoring those who have made the ultimate sacrifice, during a week-long celebration of Memorial Day events, remembrances and services

On September 11, 2001, two of the planes were flown into the towers of the World Trade Center in New York City, a third plane hit the Pentagon just outside Washington, D.C., and the fourth plane crashed in a field in Pennsylvania. Often referred to as 9/11, the attacks resulted in extensive death and destruction, triggering major U.S. initiatives to combat terrorism and defining the presidency of George W. Bush. Over 3,000 people were killed during the attacks in New York City and Washington, D.C., including more than 400 police officers and firefighters