Vietnam is set to hold its biggest celebration of the fall of Saigon on its 50th anniversary Wednesday, including Chinese troops for the first time after Xi Jinping visited to portray Beijing as a more reliable partner than Washington.

The day the Vietnam War ended has become a high-profile celebration in Vietnam. But debates over the name of the April 30 holiday reveal lingering sensitivities within the country and beyond

The Vietnam War greatly impacted U.S. society from the passage of the War Powers Resolution that restricts the president’s ability to send troops into extended combat without congressional approval to the cementing of college campuses as centers of student activism.