In pictures: The Vietnam War

The bodies of US Marines lie half buried on Hill 689, west of Khe Sanh, in 1968. The siege at Khe Sanh was one of the longest and bloodiest battles of the war.

Nearly 60,000 US soldiers died in Vietnam with over 300,000 injured.

For the Vietnamese, though, the figure was far higher with estimates of over half a million killed and many millions wounded.