Before going for a Caribbean cruise you must make sure that you have all the travel documents that you require to have as a citizen of United States.  According to the rules of the region, different traveling situation calls for different requirements. USA issues both passport cards and passport books to their residents. Whether or not the Caribbean cruise will ask for your identity proof in form of passport card, passport book or any other document depends on what type of cruise it is, open loop or closed loop. Closed loop cruises are cruises that start from and come back in the same port of the United States. According to the regulations set by the Department of Homeland Security of United States, US residents traveling on closed loop cruises may need to present a certified or original  [...] 

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