Since the 9.11 terrorist attack in 2001, fears have grown that seaports would be exploited or disrupted by the act of terrorism. As a result, to safeguard global marine trade while enabling legitimate cargoes to move faster and more efficiently through the supply chain to ports, lots of multinational initiatives and nationwide legislation have been introduced. Such newly-adopted regulations forced port terminal operators to establish the Supply Chain Security Management (SCSM) system on the global standards while carrying out their original functions of loading and discharging cargoes. This paper aims to identify the roles of terminal operators in terms of the SCSM to distinguish difference in commencing the activities among various types of operators.