The Chamber of Shipping of America (CSA) represents U.S. based companies that either own, operate or charter oceangoing tankers, container ships, dry bulk vessels engaged in both the domestic and international trades and companies that maintain a commercial interest in the operation of such oceangoing vessels. Current members include companies that own or operate U.S. flag or foreign-flag ships. A company owning or operating only foreign-flag tonnage must have an office in the United States to qualify for membership.