Admiral Thad Allen, Commandant of the Coast Guard, spoke with MarineNews about the merchant mariner credentialing process, TWIC, the new Centers of Expertise and the modernization of the Coast Guard's internal organization. Visit the Commandant's blog at www.uscg.mil/comdt/blog for more of his perspectives on the workings of the Coast Guard. What's the Coast Guard doing to simplify the merchant mariner credentialing process? Merchant mariner credentialing has been the subject of a lot of concern and reforms going back 10 or 15 years, to when I was a field commander.