Leftist activists split with the AFL-CIO in the 1960s over the Vietnam war when its longtime leader, ex-plumber George Meany, sided with the fiercest hawks in the Johnson and Nixon administrations.

ECONOMIST: The epic story of labour in America

When pressed he said it was a piece of unexploded ordnance left over from the Vietnam War.

BBC: Lao people

During the Vietnam War, the U.S. Air Force laced the skies over North Vietnam and parts of Laos with small quantitites of aerosols designed to amplify the intensity of rainfall patterns by enhancing the density of clouds.

FORBES: "Cloud Computing" of the Not-So-Virtual Sort

The word gained an airing across the world 40 years ago, at the first UN environment summit in Stockholm, when Sweden's Prime Minister Olof Palme levelled the charge against the US over its use of defoliant chemicals during the war in Vietnam.

BBC: Ecocide: A legal green high?

The poll also found that the dispute over Kerry's antiwar activism after the Vietnam War is having more of a negative effect on his candidacy than questions about Bush's National Guard service are having on his electability.

CNN: Bush apparently leads Kerry in pre-debate poll

Her glorious soprano soared to us from record players and transistor radios, from folk clubs and grand concert halls, over the public address system at rallies against the war in Vietnam and now through the ear buds of our iPods.

NPR: Judy Collins, From Both Sides Now

In search of traction for his flagging campaign, McCain has delivered a series of speeches this month intended to showcase his serious credentials -- a former prisoner of war in Vietnam who made himself a military and defense expert over 25 years in Congress.

CNN: Can McCain campaign get traction?

When communist forces in Vietnam unleashed the Tet Offensive, it fueled the debate here at home that raged over that war.

WHITEHOUSE: President Obama at the American Legion Conference