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.
The War in Afghanistan lasted just over 13 years and the Vietnam War nearly 11. By contrast, U.S. participation in the Second World War ended after 3.7 years. The U.S. admits the obviously unworkable plan to get rid of ISIS is unprecedented.