They were used to increase mobility
(in the Vietnam War) the US policy of withdrawing its troops and transferring the responsibility and direction of the war effort to the government of South Vietnam.
Sadly, about 2,996 people died during the attack of September 11, 2001.
2,996 of those people included 19 terrorists, the 265 people on the 4 planes, 2,606 people from the World Trade Center and 125 in The Pentagon.
I hope this helped - Maria S.
