Erik Tremblay is at ease in the driver’s seat of a tow truck, hauling broken-down 18-wheelers on the highway. It sometimes reminds him of driving fire trucks over dusty terrain in Iraq, where the former Marine served two tours of duty. “My Marine training helped me out,” said Tremblay, 31, of Georgetown, who now works at Export Towing in Medford. “I knew how to maneuver large vehicles. I felt at home behind the wheel.”
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