Why were fighting conditions so difficult for US soldiers on the ground?

Fighting conditions for US soldiers on the ground were often extremely challenging due to a combination of factors, including harsh environmental conditions, such as extreme heat or cold, and difficult terrain that hindered movement and visibility. Additionally, the presence of well-entrenched enemy forces utilizing guerrilla tactics made combat unpredictable and dangerous. Limited resources, logistical challenges, and the psychological toll of prolonged engagements further exacerbated the difficulties faced by soldiers in the field.