SKorean and US marine corps train in snow for three weeks South Korea Marine Corp and the U.S. Marine Corp carry out a joint winter season tactical training at Pyeongchang, South Korea. The training started 15 January 2017 and will end on 3 February 2017, lasting for a total of three weeks. With temperatures dipping down to even -30 degrees Celsius at times, marines from both countries must undergo various physical and tactical training. IMAGES AND SOUNDBITES of Military exercise in Pyeongchang