JBER celebrates thaw at Hillberg Ski Area 2018 Slush Cup Published March 21, 2018 By Airman 1st Class Crystal A. Jenkins JBER Public Affairs JOINT BASE ELMENDORF-RICHARDSON, Alaska -- Personnel and families take part in the 2018 Slush Cup at the Joint Base Elmendorf-Richardson Hillberg Ski Area, March 18, 2018. The Slush Cup is a two-fold annual event celebrating the change in weather, consisting of skiers and snowboarders trying to make it across a man-made slush pond without falling.