These mailable vintage-photograph postcards celebrate Colorado's ski patrol, which has grown from a volunteer operation to a professional workforce--incorporating advancements in lifesaving techniques, avalanche forecasting, and specialized guest services. The Army's 10th Mountain Division, developed during World War II for combat missions in the mountains of northern Italy, evolved into ski patrols as we know them today. Far-reaching and nuanced, the job of a ski patroller combines long days, physically demanding work in high alpine environments, and the ability to respond to complex medical emergencies.