The United States marked 25 years since the attacks of September 11, 2001, with observances at the three places where that morning ended so many lives: the World Trade Center in New York, the Pentagon in Arlington, Virginia, and a field outside Shanksville, Pennsylvania.

In New York the ceremony followed the shape it has taken for a quarter of a century. Family members climbed to the microphone and read the names of those lost, all 2,977 of them, along with the six killed in the 1993 bombing of the same buildings. Six times the reading stopped for silence, marking the minutes when each tower was struck, when the Pentagon was hit, when Flight 93 came down in Pennsylvania, and when each tower fell. Strangers stood together at the reflecting pools and listened to names they did not know, spoken by people who loved them.

Those remembered were office workers and flight attendants, cooks and traders, custodians and executives, visitors and pilots. They came from more than 90 countries and prayed in many languages, or in none. They went to work or boarded a plane on an ordinary blue morning and never came home.

Among them were 343 New York City firefighters, 37 Port Authority police officers and 23 New York City police officers. They climbed while everyone else descended. That choice, made in stairwells filling with smoke, is the plainest account of courage this country has.

The cost did not stop when the fires went out. Tens of thousands of responders, construction workers, cleaners and residents breathed the air at Ground Zero through months of recovery, and many have been sick ever since. They are still pressing for the care they were promised, most recently for coverage of the illnesses that arrive late and take the mind. Their service did not end in 2001, and neither did the bill for it.

The work of return also continues. The medical examiner's office in New York has never closed the effort to identify remains, so that families who have waited 25 years might still be given someone to bury. Some were laid to rest only this season.

Service members who answered in the years that followed carried the day forward into their own long deployments, and many of them did not come back either.

The reading of the names is the heart of all of it. Each one belonged to a person. A country that still says them out loud is a country that has not let go.