The Maritime Transportation Security Act (MTSA) of 2002 explicitly required the issuance of a biometric transportation security card to all U.S. merchant mariners and to workers requiring unescorted access to secure areas of MTSA-regulated facilities and vessels. On May 22, 2006, the Transportation Security Administration (TSA) and the Coast Guard published a notice of proposed rulemaking (NPRM) to carry out this statute, proposing a Transportation Worker Identification Credential (TWIC) Program where TSA conducts security threat assessments and issues identification credentials, while the Coast Guard requires integration of the TWIC into the access control systems of vessels, facilities, and Outer Continental Shelf facilities. Based on comments received during the public comment period, TSA and the Coast Guard split the TWIC rule. The final TWIC rule, published in January 2007, addressed the issuance of the TWIC and use of the TWIC as a visual identification credential at access control points. In an ANPRM, published in March 2009, and a NPRM, published in March 2013, the Coast Guard proposed a risk-based approach to TWIC reader requirements and included proposals to classify MTSA-regulated vessels and facilities into one of three risk groups, based on specific factors related to TSI consequence, and apply TWIC reader requirements for vessels and facilities in conjunction with their relative risk-group placement. This rulemaking is necessary to comply with the SAFE Port Act and to complete the implementation of the TWIC Program in our ports. By requiring electronic card readers at vessels and facilities, the Coast Guard will further enhance port security and improve access control measures.