Customs-Trade Partnership Against Terrorism (C-TPAT) is a U.S. Customs and Border Protection (CBP) voluntary trade partnership program that focuses on improving security throughout the supply chain, beginning at the point of origin (including manufacturer, supplier, or vendor) through a point of distribution to the destination. The Siemon Company is proud to be a validated C-TPAT partner and commits to protecting our supply chain from terrorist infiltration and other illegal activities that threaten the security of the United States.