President Jimmy Carter waves to the crowd while walking with his wife, Rosalynn, and their daughter, Amy, along Pennsylvania Avenue from the Capitol to the White House following his inauguration in Washington, D.C., on Jan. 20, 1977. On the following day, he issued a pardon for people who had evaded the Vietnam War draft. Suzanne Vlamis/AP hide caption
John Kerry (center) stands with other military personnel in an unspecified location circa the 1960s. The details of Kerry's service during the Vietnam War, and his subsequent anti-war activism, became the focus of a veterans' group's smear campaign against him during his 2004 presidential campaign. Kerry Campaign/Getty Images hide caption
Ohio National Guard members move toward students at Kent State University in Kent, Ohio, on May 4, 1970. They fired into the crowd, killing four students and injuring nine. AP hide caption
View of a collection of defused cluster bombs and grenades used by an international bomb disposal group for training in Savannakhet, Laos, on May 2, 2006. Jerry Redfern/LightRocket via Getty Images hide caption
Visitors look at an exhibition of South Korean soldiers' records from the Vietnam War at the War Memorial of Korea in Seoul, Feb. 17. Ahn Young-joon/AP hide caption
Daniel Ellsberg speaks during an interview in Los Angeles on Sept. 23, 2009. Ellsberg, who copied and leaked documents that revealed secret details of U.S. strategy in the Vietnam War and became known as the Pentagon Papers, has announced he has terminal cancer and months to live. Nick Ut/AP hide caption
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Vietnam War veteran and triple amputee Max Cleland delivers a speech during a campaign appearance. Cleland died on Tuesday at age 79. Thomas S England/Getty Images hide caption
Bao Nguyen's older sister Giang Nguyen (left) and his mother Mai Tran (center) stand with Laurie Lemel, the vice director of Jewish Council Services of Madison, Wis., who greeted them at airport arrival in October 1979 after Nguyen's family spent six months in a Hong Kong refugee camp. Bao Nguyen hide caption
Journalist Neil Sheehan, pictured at the time as a reporter for UPI, died recently at the age of 84. Bettmann/Bettmann Archive hide caption
The U.S. death toll from COVID-19 hit a new milestone, surpassing the number of Americans who died in the prolonged conflict with Vietnam. Here, the Elmhurst Hospital Center in Queens, N.Y., holds a vigil for medical workers and patients who have died in the pandemic. John Nacion/NurPhoto via Getty Images hide caption
Ka Lo, a member of the Marathon County Board in Wausau, Wis., spoke about the Trump administration's immigration policies at a Feb. 13 rally in the city. Rob Mentzer/Wisconsin Public Radio hide caption