General William Westmoreland led US troops in Vietnam and argued that the Army of Vietnam could not defeat the Vietcong without US support. He pursued a war of attrition to exhaust the enemy through casualties. US forces engaged in search and destroy missions that caused civilian resentment. The Vietcong effectively used guerrilla warfare with small, mobile groups and a network of tunnels, while the US relied on strategies like carpet bombing and Agent Orange spraying that failed to defeat the elusive enemy. As the human and financial costs of the war escalated at home, public support for the war declined due to the contrast between government messages and negative news coverage.