During the ceremony, a group of survivors of the Dec. 7, 1941, attack announced that they would disband at the end of the month. William Muehleib, president of the Pearl Harbors Association, cited age and poor health of the remaining members.
Survivors will be able to attend future commemoration ceremonies on their own. About 3,000 people, including Navy Secretary Ray Mabus and military leaders, attended this year's 70th anniversary event at a site overlooking the sunken USS Arizona and the white memorial that straddles the battleship.
"It was time. Some of the requirements became a burden," Muehleib said after the ceremony. Most of the survivors have realized that at their age, there are other things they'd like to do, he said.
He said the association has 2,700 members but there are an estimated 7,000 to 8,000 Pearl Harbor survivors. Local chapters will function as long as they have members and survivors can gather socially, but they will no longer have a formal, national organization.
The group's announcement came as President Barack Obama hailed veterans of the bombing in a statement proclaiming Wednesday as "National Pearl Harbor Remembrance Day." The attack brought the United States into World War II.
"Their tenacity helped define the Greatest Generation and their valor fortified all who served during World War II. As a nation, we look to December 7, 1941, to draw strength from the example set by these patriots and to honor all who have sacrificed for our freedoms," he said.
Also this week, five ash scattering and interment ceremonies are being held for five survivors whose cremated remains are returning to Pearl Harbor after their deaths.
On Tuesday, an urn containing the ashes of Lee Soucy was placed on his battleship, the USS Utah, which is lying on its side near the place where it sank. The ashes of Vernon Olsen, who was on the Arizona during the attack, will be placed on his ship late Wednesday.
The U.S. lost 12 vessels that day, but the Arizona and the Utah are the only ones still sitting in the harbor.
The ashes of three other survivors will be scattered in the water in separate ceremonies this week.
USS Utah survivor Gilbert Meyer said he comes back each year to see his shipmates entombed in the battleship which rests not far from where it sank off Ford Island.
Meyer, 88, recalled his ship rolling over after being hit by a torpedo and seeing Japanese planes dropping bombs. When the planes began showing machine gun fire, he knew it was time to move.
"That really got my attention so I got in the water and swam ashore," he said.