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.
By the early-1960's, the United States Army was again engaged in conflict, now in Vietnam. As the war progressed, the attrition of combat, the 12-month tour limit in Vietnam, separations. of senior noncommissioned officers and the 25-month stateside stabilization policy began to take.