Final answer:
The American military faced difficulties in the Vietnam War due to guerilla warfare tactics, unfamiliar terrain and climate, and lack of public support.
Step-by-step explanation:
The American military faced several difficulties in the Vietnam War. One major challenge was the guerilla warfare tactics used by the Viet Cong and North Vietnamese Army. These tactics involved ambushes, hit-and-run attacks, and blending in with the civilian population, making it difficult for the American forces to distinguish between enemy combatants and innocent civilians.
Another difficulty was the unfamiliar terrain and climate of Vietnam. The dense jungles and swamps made it challenging for American troops to navigate, while the hot and humid weather took a toll on their physical endurance.
Furthermore, the lack of public support for the war back home in the US also posed a significant problem for the American military. The anti-war movement and protests against the war impacted morale within the military and affected recruitment efforts.