UPPER MARLBORO, Maryland, Aug. 24 -- International Association of Machinists and Aerospace Workers issued the following news release: More than 4,300 IAM Local S6 members at Bath Iron Works, a subsidiary of General Dynamics, have voted 87 percent to ratify a three-year collective bargaining agreement at the Maine shipbuilding company. IAM Local S6 members, who build destroyers for the U.S. Navy, will return to work beginning with third shift on Sunday, Aug. 23. The approved contract includes s  more