Answer:
During the Vietnam War, the US government and military may have used the term "communist insurgents" to make the war seem like a fight against an outside communist threat to the free world rather than a fight by the Vietnamese people for their own freedom. This helped to explain why the US military had to get involved and gave the impression that the US was fighting for democracy and freedom against communism. Also, the word "insurgents" makes it sound like the Vietnamese were fighting against an established government instead of for their own freedom. This makes it harder to understand how complicated the conflict was and why the Vietnamese didn't want to support the US-backed government.