The International Traffic in Arms Regulations (ITAR) is a set of United States government regulations that control the export and import of defense-related articles and services on the United States Munitions List. The acronym TASS stands for the Technical Assistance Service System, which is a system used to track and monitor the export of defense-related articles and services. TASS is an important component of ITAR, as it helps ensure that the export of defense-related articles and services is done in accordance with the regulations set forth by ITAR.