Who Must Get a TWIC Card?

http://www.youtube.com/user/USMerchantMarines?feature=mhee Who Must Get a TWIC Card | Transportation Worker Identification Credential

Coast Guard-credentialed merchant mariners, port facility employees, long shore workers, truck drivers, and others requiring unescorted access to secure areas of maritime facilities and vessels regulated by MTSA are required to get a TWIC.