The US Arab Chamber of Commerce assists U.S. forwarders and exporters to legalize Commercial Invoices and Certificate of origin for use in the Arab Countries Documents must be mailed to our USACC Legalization Office in Maryland. Documents will be processed on the same received business day. Start by clicking on the desired country name, and you will be directed how to complete your request. Our new computerized system automatically e-mails customers when their packages are received, and again when their completed documents are shipped back.