Double-amputee Kevin Pannell snowboards toward a ski instructor through a half pipe Jan. 29 in Vail, Colo. Pannell, from Portland, Ore., lost both legs in a grenade attack when his Army patrol was ambushed by Iraqi insurgents in 2004. He was part of a group of a dozen war wounded and their families participating in the Vail Veterans Program winter ski retreat. The program is designed to help severely wounded U.S. service members rehabilitate and rebuild confidence through learning to ski and snowboard. Some of the wounded are flown in directly from Walter Reed Army Medical Center in Washington, D.C.…