The Memorial Day is a federal holiday in the United States for remembering people who have died while serving in the country's armed forces. (Photos: Xinhua)

Veterans take part in the Memorial Day Parade in Chicago, the United States, on May 25, 2019. The Memorial Day is a federal holiday in the United States for remembering people who have died while serving in the country's armed forces.

Family members of fallen soldiers attend the Memorial Day Parade in Chicago, the United States, on May 25, 2019. The Memorial Day is a federal holiday in the United States for remembering people who have died while serving in the country's armed forces.

Participants take part in the Memorial Day Parade in Chicago, the United States, on May 25, 2019. The Memorial Day is a federal holiday in the United States for remembering people who have died while serving in the country's armed forces.

Chicago mayor Lori Lightfoot (2nd L, front) takes part in the Memorial Day Parade in Chicago, the United States, on May 25, 2019.

Participants take part in the Memorial Day Parade in Chicago, the United States, on May 25, 2019.

Participants take part in the Memorial Day Parade in Chicago, the United States, on May 25, 2019.