Customs brokers in the United States prepare and submit documentation to notify or obtain clearance from government agencies such as the U.S. Food and Drug Administration, the U.S. Department of Agriculture, and the Fish and Wildlife Service. They also arrange the transhipment (i.e., local delivery) of merchandise via trucking companies. Many customs brokers specialize in certain goods like apparel, perishables, or clearing the crew and manifest of large cargo vessels. Most are located at major airports and harbors with international traffic. However, with the advent of the Automated Broker Interface and rules allowing customs brokers to be permitted nationally (as opposed to specific ports), customs brokers no longer need to be located near a port.