There are more than 200,000 headstones at Arlington National Cemetery.
As Memorial Day approaches, every service member buried at Arlington National Cemetery is honored by having a flag placed on their grave.
The ceremony, known as "Flags In," takes place every year.
Soldiers from the 3rd U.S. Infantry Regiment, known as The Old Guard, have put American flags at each grave for more than 60 years. Today, there are more than 228,000 headstones.
It takes the soldiers four hours to complete the task.
“It's very humbling. I'm so honored to be able to do this,” one soldier said.
“It's a great honor being in The Old Guard,” added another.
“We get to give our respects to all those that have been laid here to rest,” said another.
The Old Guard soldiers first read each headstone, then they measure exactly 1 foot from the headstone and plant the flag.
President Trump and first lady Melania Trump made an unannounced visit to participate in Thursday’s "Flags In" event.
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