Which 1967 anti-war protest marched to a US military headquarters outside Washington, D.C.?

The 1967 anti-war protest that marched to a US military headquarters outside Washington, D.C., was the March on the Pentagon. It took place on October 21, 1967, as opposition to the Vietnam War grew more visible and organized.

The demonstration was organized by the National Mobilization Committee to End the War in Vietnam. Roughly 100,000 people gathered near the Lincoln Memorial, and about 50,000 marched across the Potomac River toward the Pentagon in Arlington, Virginia. Protesters held a second rally there and some attempted to enter the building, leading to a confrontation with troops and arrests.

The event became famous for its theatrical symbolism, including Abbie Hoffman’s claim that activists would try to “levitate” the Pentagon. Photographs of demonstrators placing flowers in soldiers’ rifle barrels helped define the era’s image of nonviolent protest. It is different from the 1969 Moratorium to End the War in Vietnam and the 1970 May Day demonstrations.