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.
When Did the Vietnam War Start? Vietnam War started in March 1959 and lasted for almost 26 years. The North Vietnamese Army used conventional military tactics and strategies in the war while the South Vietnamese Army and the U.S. Army implement air strikes as well as search and destroy operations.