The Ozone layer, which mostly lies on the lower portion of the stratosphere.
How Long Did The Vietnam War Last. The Vietnam War is the longest war ever to have taken place in the American history. It lasted for 16 years and it was terrible for the Americans at that time as the Civil Rights campaign was at its peak and so also the Vietnam War and anti war protests.
Military Health History Pocket Card for Clinicians. America's involvement in Vietnam lasted from 1957 until 1975. In 1954, the French were defeated and the former colony of French Indochina was divided into Communist North Vietnam and (non-Communist) South Vietnam.