SYRACUSE, N.Y. – Travis Chewning-Kulick is used to running marathons. He’s run 11 of them, including the Boston Marathon – his favorite – five times. The Liverpool native has completed the Mountain Goat , the Boilermaker , the Race for the Cure, the Swamp Rat Run and the Liverpool Turkey Trot on Onondaga Lake Parkway. He’s been an avid runner since elementary school and continues to run upwards of 50 miles a week. But on April 25 at Fort Cavazos, an Army post in Texas, Capt. Chewning-Kulick ran