170123-N-HD510-0075 BRECKENRIDGE, Colo. (Jan. 23, 2017) East coast-based Navy SEALs forge a trail in the backcountry using skis during Winter Warfare training Jan. 23, 2017 in Breckenridge, Colo. SEALs are practicing skills during work ups they will need during deployment. (U.S. Navy photo by Mass Communication Specialist 2nd Class Scott Fenaroli/Released)