你是对的，应该是“和平队”。下面是我从Longman在线词典查到的peace corps的结果：
Peace Corps, the
a US government organization that aims to help poorer countries, by sending them volunteers (=people who work without payment), especially young people, who teach skills in education, health, farming etc
维和部队常用peace keeping force.
其实我在翻译的时候想到过，后来为了贪求速度，没有去查，太草率了，不好意思。再次感谢啊，握手。

谢谢关注。peace corps按照字面理解即是维和部队，如有不妥，请指教。