He placed a wreath at the edge of the year-old memorial, where markers and benches bear the names of loved ones. The President assured families that the world will never forget the sacrifice of those aboard American Airlines Flight 77 or those working inside the Pentagon on Sept. 11, 2001.
Terri Johnson and her family told NBCWashington's Julie Carey that they come to the anniversary observance each year to celebrate sister Brenda Gibson’s life, but they also want to make sure Americans always remember..
"We as a family don’t want anyone to forget," Johnson said.
The family of Pentagon employee Jimmie Holley agreed, adding that the annual remembrance is an essential pilgrimage for them.
"To keep his memory alive... it's something I will do every year until I die," Martha Holley said. "As long as I have strength, I'll be here every year at this time."