ROCKY HILL, Conn. — Army radar veteran and retired sports store owner Bill Carroll is crazy about keno. On the bar table at Veterans of Foreign Wars Post 9460 in Stratford, a red, white and pink keno ticket rested last Friday between his hands, taking a stab from his No. 2 pencil after numbers flickered on a screen above a rack of liquor bottles. “I had a shot at $500,” he said, eyeing the screen through gold-rimmed glasses from beneath a black Yankees cap. Carroll was quick to answer questions, but short on words. What would he do with $500?