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Boston, Massachusetts (CNN) The patches on little Devin Suau's police uniform span the width of his arms. An oversized officer's hat covers the six-year-old's nose -- so he tips it back.

Despite his honorary status as a police commissioner, Devin's red sneakers aren't part of the Boston Police Department's official uniform. They're the preferred footwear of a precocious boy whose favorite things include chocolate, ice cream and hanging out with police.

Boston PD is helping Devin face a life-threatening disease with strength and courage.

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"Getting up in the morning, very early, 6:30 a.m., and going in for radiation -- he doesn't complain," said Devin's uncle, Boston Police Officer Justin Cremins. "He just gets up, pulls up his socks and his boots, and in he goes. I'm really proud of him."

Life changed for the Suau family during a vacation back in January, when Devin fell off a snowboard and hit his head. His parents feared he'd suffered a concussion.