US Arab Chamber of Commerce | Washington D.C. The US Arab Chamber of Commerce (USACC) is a nationally recognized chamber, located on Dupont Circle, Washington D.C., with a mission to serve U.S. businesses that export products or provide services to the Middle East. There is no need to become a member to use the services of USACC. USACC offers the following expedited services: Affixing the stamp of the chamber as required by Arab countries (same day service). Business document authentication from the U.S. Department of State & all Arab embassies. Embassy certification for shipping documents (Certificate of Origin and Invoice)..