Lance Cpl. Sean Adams’ days are waning in his beloved U.S. Marine Corps, with his planned retirement later this month marking a “more bitter than sweet” transition to civilian life. He’s considering a future in racing, “but I’ll never find anything to give me the spark that the Marine Corps has given me,” said the 2011 Chestatee High School graduate who lost his legs to a roadside bomb in Afghanistan. A retirement ceremony at Walter Reed National Military Medical Center in Bethesda, Md., will officially end what had been dreams of military life.