A man views 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. (Xinhua/Wang Qiang)

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. (Xinhua/Wang Qiang)

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. (Xinhua/Wang Qiang)

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. (Xinhua/Wang Qiang) 
 

Chicago mayor Lori Lightfoot (2nd L, front) takes 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. (Xinhua/Wang Qiang)

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. (Xinhua/Wang Qiang)

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. (Xinhua/Wang Qiang)