This report is the third in a series describing the development of performance measures pertaining to the security of the maritime transportation network (port security metrics). This report focuses on issues related to the mission of the Defense Threat Reduction Agency's (DTRA) Advanced Systems and Concepts Office (ASCO). This report represents a continuation of those earlier efforts and presents a contribution to the continual refinement of the Maritime Security Risk Analysis Model (MSRAM), the U.S. Coast Guard's (USCG) principal analytic decision support tool for determining port risk.