One million port and longshore workers, truckers and others at ports across the nation have enrolled in the Department of Homeland Security's Transportation Worker Identification Credential (TWIC) program. The program's goal is to ensure that any individual who has unescorted access to secure areas of port facilities and vessels has received a thorough background check and is not a known security threat. Today, 36 of the 42 Captain of the Port Zones across the country require workers to have a TWIC. All ports must be in compliance with credential requirements by April 14, 2009. Port security personnel are trained to ensure workers have valid cards and Coast Guard officials are conducting random compliance inspections at these ports.