In this Thursday, Feb. 20, 2020, photo, a U.S. military policeman and South Korean security persons U.S. Army base Camp Walker, in Daegu, South Korea. The U.S. and South Korean militaries, used to being on guard for threats from North Korea, face a new and formidable enemy that could hurt battle readiness: a virus spreading around the world that has infected more than 1,200 people in South Korea. (Kim Hyun-tae/Yonhap via AP)
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