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U.S. Air Force Senior Airman Jesse Cash, a 66th Training Squadron, Detachment 1 survival, evasion, resistance and escape (SERE) specialist demonstrates how to cut out a block of hard-packed snow at Utqiaġvik (Barrow), Alaska, Jan. 11, 2021. The snow blocks were used to construct a wind-wall to shelter students’ tents during the first night of training.