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U.S. Paralympic skier and cancer survivor Thomas Walsh puts on his ski boot liners next to a fireplace in the Golden Peak Lodge at Vail before a training session Jan. 30, 2018. Walsh is training for the 2018 Winter Paralympic Games in PyeongChang South Korea.

U.S. Paralympic skier and cancer survivor Thomas Walsh radios a coach at the top of a slalom run during a training session at Vail Jan. 30, 2018. Walsh is training for the 2018 Winter Paralympic Games in PyeongChang South Korea.

U.S. Paralympic skier and cancer survivor Thomas Walsh launches out of the start gate on a slalom course during a training session at Vail Jan. 30, 2018. Walsh is training for the 2018 Winter Paralympic Games in PyeongChang South Korea.

VAIL, CO - JANUARY 30: U.S. Paralympic skier and cancer survivor Thomas Walsh heads to the slalom course at Vail for a training session January 30, 2018. Walsh is training for the 2018 Winter Paralympic Games in PyeongChang South Korea. (Photo by Andy Cross/The Denver Post)

U.S. Paralympic skier and cancer survivor Thomas Walsh negotiates slalom poles on course during a training session at Vail Jan. 30, 2018. Walsh is training for the 2018 Winter Paralympic Games in PyeongChang South Korea.

U.S. Paralympic skier and cancer survivor Thomas Walsh negotiates slalom poles on course during a training session at Vail Jan. 30, 2018. Walsh is training for the 2018 Winter Paralympic Games in PyeongChang South Korea.

U.S. Paralympic skier and cancer survivor Thomas Walsh, right, talks with coach Max Lamb after clipping a pole and crashing during a training session at Vail Jan. 30, 2018. Walsh is training for the 2018 Winter Paralympic Games in PyeongChang South Korea.

U.S. Paralympic skier and cancer survivor Thomas Walsh gets a drink in between slalom runs during a training session at Vail Jan. 30, 2018. Walsh is training for the 2018 Winter Paralympic Games in PyeongChang South Korea.

U.S. Paralympic skier and cancer survivor Thomas Walsh negotiates slalom poles on course during a training session at Vail Jan. 30, 2018. Walsh is training for the 2018 Winter Paralympic Games in PyeongChang South Korea.

U.S. Paralympic skier and cancer survivor Thomas Walsh heads down a slalom course during a training session at Vail Jan. 30, 2018. Walsh is training for the 2018 Winter Paralympic Games in PyeongChang South Korea.

U.S. Paralympic skier and cancer survivor Thomas Walsh states his dislike for cancer on the back of his helmet during a training session at Vail Jan. 30, 2018. Walsh is training for the 2018 Winter Paralympic Games in PyeongChang South Korea.