US soldiers did not know well the territory with tropical rainforest and high rainfall, unlike the Viet Cong who knew the geography of the place very well, using it to their advantage to carry out guerrilla attacks against the enemy more powerful and with modern armaments and helicopters.
Explanation:
The Vietnam War, begun in 1959 and extended until 1975, was the confrontation between North Vietnam and South Vietnam, both struggling to unify the country under its rule. The conflict in Vietnam began in 1965 with the active participation of the United States Army, which fought alongside the troops of South Vietnam against the forces of North Vietnam.
The United States' participation in the war, in fact, failed to defeat the Vietcong forces. Using the geographic knowledge of the jungles and guerrilla tactics, the Viet Congians made the battles exhausting for US forces. In addition, the use of armaments, such as the Napalm incendiary bombs, attacks on civilians and large numbers of Americans killed in the conflict boosted a US media campaign over the country's exit from the conflict.