Across the United States, people are paying tribute to those who died while serving their country.

The Memorial Day holiday is observed on the last Monday in May. The three-day weekend also serves as the unofficial start to the summer season.

US Navy sailors carry flags Monday during the Intrepid Sea, Air & Space Museum's annual Memorial Day Commemoration Ceremony in New York City.
US Navy sailors carry flags Monday during the Intrepid Sea, Air & Space Museum's annual Memorial Day Commemoration Ceremony in New York City.
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David Loesch, a Vietnam War veteran, wipes rainwater from a soldier's name on the Vietnam Veterans Memorial in Washington, DC.
David Loesch, a Vietnam War veteran, wipes rainwater from a soldier's name on the Vietnam Veterans Memorial in Washington, DC.
Samuel Corum/Getty Images
Members of the Veteran Service Organization fire a 21-gun salute during a Memorial Day parade in Brooklyn, New York.
Members of the Veteran Service Organization fire a 21-gun salute during a Memorial Day parade in Brooklyn, New York.
Yuki Iwamura/AFP/Getty Images
President Joe Biden participates in a wreath-laying ceremony Monday at the Tomb of the Unknown Soldier at Arlington National Cemetery.
President Joe Biden participates in a wreath-laying ceremony Monday at the Tomb of the Unknown Soldier at Arlington National Cemetery.
Mandel Ngan/AFP/Getty Images
Army National Guard members carry the casket of Medal of Honor recipient Luther Story, who was reintered with military honors at Andersonville National Cemetery on Monday. The Korean War hero was initially unidentified and buried as an unknown soldier at the National Memorial Cemetery of the Pacific in Honolulu.
Army National Guard members carry the casket of Medal of Honor recipient Luther Story, who was reintered with military honors at Andersonville National Cemetery on Monday. The Korean War hero was initially unidentified and buried as an unknown soldier at the National Memorial Cemetery of the Pacific in Honolulu.
Arvin Temkar/The Atlanta Journal-Constitution/Zuma Press
The Natick High School Marching Band plays the National Anthem during Memorial Day ceremonies in Natick, Massachusetts.
The Natick High School Marching Band plays the National Anthem during Memorial Day ceremonies in Natick, Massachusetts.
Art Illman/Daily News and Wicked Local/USA Today Network
Cathy Normington sets fresh flowers on the gravesite of her husband's aunt Sunday at the Bay Pines National Cemetery in St. Petersburg, Florida. She visited the gravesites of four family members who were in the military. "I make sure everybody has some flowers and I talk to them," Normington said. "I'll always find time to come."
Cathy Normington sets fresh flowers on the gravesite of her husband's aunt Sunday at the Bay Pines National Cemetery in St. Petersburg, Florida. She visited the gravesites of four family members who were in the military. "I make sure everybody has some flowers and I talk to them," Normington said. "I'll always find time to come."
Ivy Ceballo/Tampa Bay Times/Zuma Press
Marine Corps Staff Sgt. Tim Chambers salutes Sunday as people ride past him during the "Rolling to Remember" motorcycle rally in Washington, DC.
Marine Corps Staff Sgt. Tim Chambers salutes Sunday as people ride past him during the "Rolling to Remember" motorcycle rally in Washington, DC.
Jose Luis Magana/AP
The Empire State Building is lit up in red, white and blue on Saturday.
The Empire State Building is lit up in red, white and blue on Saturday.
Gary Hershorn/Corbis News/Getty Images
The GEICO Skytypers team performs during an air show in Wantagh, New York, on Saturday.
The GEICO Skytypers team performs during an air show in Wantagh, New York, on Saturday.
J. Conrad Williams Jr./Newsday RM/Getty Images
Students from Lillie B. Merrill Elementary School ride on a float during a Memorial Day Parade in Raynham, Massachusetts, on Saturday.
Students from Lillie B. Merrill Elementary School ride on a float during a Memorial Day Parade in Raynham, Massachusetts, on Saturday.
Marc Vasconcellos/The Enterprise/USA Today Network
Shelby Anderson, left, and Carli Holland join members from the Historical Unit of Southern California and other volunteers to place flags at the Los Angeles National Cemetery on Saturday.
Shelby Anderson, left, and Carli Holland join members from the Historical Unit of Southern California and other volunteers to place flags at the Los Angeles National Cemetery on Saturday.
Richard Vogel/AP
A motorcyclist on Friday shows a tattoo he designed to call attention to the mental health crisis facing veterans and the nation. Thousands of motorcyclists come to Washington, DC, every year to participate in a Memorial Day ride.
A motorcyclist on Friday shows a tattoo he designed to call attention to the mental health crisis facing veterans and the nation. Thousands of motorcyclists come to Washington, DC, every year to participate in a Memorial Day ride.
Sue Dorfman/Zuma Press
Members of the 3rd US Infantry Regiment hand out flags Thursday to be placed in Arlington National Cemetery.
Members of the 3rd US Infantry Regiment hand out flags Thursday to be placed in Arlington National Cemetery.
Andrew Harnik/AP
Bundles of American flags wait for volunteers to place them on gravestones at the Massachusetts Veterans Memorial Cemetery in Winchendon, Massachusetts, on Wednesday.
Bundles of American flags wait for volunteers to place them on gravestones at the Massachusetts Veterans Memorial Cemetery in Winchendon, Massachusetts, on Wednesday.
CJ Gunthrie/EPA-EFE/Shutterstock
A man walks among the gravestones at the Massachusetts Veterans Memorial Cemetery.
A man walks among the gravestones at the Massachusetts Veterans Memorial Cemetery.
CJ Gunther/EPA-EFE/Shutterstock