A group of U.S. Marines walk along a snow-covered trail during their advanced cold-weather training at the Marine Corps Mountain Warfare Training Center Sunday, Feb. 10, 2019, in Bridgeport, Calif. After 17 years of war against Taliban and al-Qaida-linked insurgents, the military is shifting its focus to better prepare for great-power competition with Russia and China, and against unpredictable foes such as North Korea and Iran. (AP Photo/Jae C. Hong)
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