Volunteers are taking center stage at ceremonies this year to mark the eighth anniversary of the Sept. 11 terrorist attacks.
More than 100 volunteers who worked at the World Trade Center site after the 2001 attack will read names of victims at Friday's ceremony near ground zero in New York. Vice President Joe Biden is expected to attend.
In Washington, President Barack Obama will meet with family members of the dozens killed at the Pentagon.
Former Secretary of State Colin Powell will speak at a ceremony in western Pennsylvania, where one of four hijacked jetliners crashed.
It's the first year Sept. 11 has been declared a national day of service.
Americans planned beach cleanups, packages for soldiers and fundraisers.