FLINT, MI - This Halloween, 10-year-old Luke Martin will dress up as Bluey, his favorite cartoon character — a show he watched endlessly from his hospital bed last fall as he waited for a new heart.

Luke Martin, a senior at Oakmont Regional High School, has dreamed of serving his country since he was a child and now that dream might not come true because of his peanut and tree-nut allergy. Martin ...