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.
Best Answer: How long did the Vietnam War last? Answer The U.S. sent funding and military support to French forces in Vietnam starting in 1950. By 1961 the US had military advisors stationed in Vietnam. The US did not become fully involved as a military force until 1965.