CLEVELAND - Petty Officer 3rd Class Taylor Mudrock, from Coast Guard Marine Safety Unit Cleveland checks a worker at Jonick Dock and Terminal Co. for his Transportation Worker Identification Credential Oct. 20, 2008. Port workers, longshoremen and truckers are required to obtain a TWIC by Oct. 31, 2008. Coast Guard officials will conduct spot checks to ensure that owners and operators of facilities are complying with TWIC regulations. (Coast Guard photo/Petty Officer 3rd Class William B. Mitchell)