In this Feb. 21, 2020, photo, a South Korean marine wearing a mask stands in front of the Navy Base after a soldier of the unit was confirmed to have been infected with the coronavirus on Jeju Island, 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. (Woo Jang-ho/Yonhap via AP)
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