By 1967, Americans increasingly found themselves divided into two camps regarding the war. Those who strongly opposed the war and believed the United States should withdraw were known as "doves". Feeling just as strongly that America should unleash much of its greater military force to win the war were the "hawks".
For those who will ally with the hawks thinks that the way to win the war is to increase U.S. military strength. They also believed that U.S. must stop the spread of communism.
On the other hand, those who will ally with the doves thinks that the U.S. should not fight another country’s war.
Regarding the war, Americans were divided between “Hawks” and “Doves.” Hawks saw the war as a crusade against communism. They felt that communism had to be stopped at all costs. They pointed to the utter disregard for human life shown by communists and to the brutality of such communist dictators as Stalin and Mao Zedong as proof that communism was a threat to the entire free world. The Hawks believed that American involvement in Vietnam was morally right and absolutely necessary. Doves objected to the war for a number of reasons. Many felt that it was not our concern. Others argued that the war was unwinnable and not worthy of support. Some were anti-war because of America’s use of such weapons as napalm and Agent Orange, the latter a defoliant used to clear large areas of foliage so that the Viet Cong could be more easily located. Doves claimed that the use of chemicals hurt the South Vietnamese farmer more than it did the Viet Cong. Finally, some doves of draft age simply did not wish to serve in the war. As many as 50,000 young men fled to Canada and Sweden to avoid the draft.
Read bout the Vietman War at History.com.