Yes it is true on most closed loop USA homeport cruises that a US citizen does not need a passport book and can instead use what is considered WHTI compliant alternative forms of ID and proof of nationality. Another key element is the passenger can only disembark in ports that participate in the WHTI agreement if they do not have their passport book (some ports non-agreement nations like Martinique will allow passengers without a passport book to visit, but only within the secured port area).
Photo Identification is required of all passengers 16 years of age and older. Must include given and surname, date of birth, and a clear expiration date, The following are acceptable:
Driver's License (a temporary Driver's License with photo is acceptable); or
Driver's Permit; or
School/Student I.D. for minors16 -18; or
U.S. Military I.D. with photo, (Military Dependent IDs are no longer accepted); or
A city/state/federal non driver's ID card; or
Tribal/Reservation resident ID
Note: The name on the Photo ID must match the given and surname on the booking/passenger manifest
Plus
A U.S. citizen, of any age, will need to be able to present either of these as proof of citizenship:
an original, notarized or certified copy of his or her birth certificate; or
a Consular Report of Birth Abroad issues by Department of State; or
a Certificate of Naturalization issued by U.S. Citizenship and Immigration Services.
Note: If the name on the proof of citizenship does not match the name on the photo ID legal name change document may also be asked for to show a clear linkage from birth name to current name. These may include marriage licenses, divorce decrees, adoption papers, and court vetted name changes filings. Also religious paperwork like Baptismal certificates and hospital certificates of birth are not acceptable. Voter registration cards or Social Security are not considered proof of citizenship.
Here is the list of the preferred documents:
U.S. citizen adult travelers can present a valid:
U.S. Passport; or
Passport Card; or
Enhanced Driver’s License as issued by Michigan, Minnesota, New York, Vermont, & Washington; or
Trusted Traveler Program card (NEXUS, SENTRI or FAST); or
U.S. Military identification card when traveling on official orders; or
U.S. Merchant Mariner document when traveling on official business; or
Form I-872 American Indian Card; or
Enhanced Tribal Card (when available).
Canadian citizen adult travelers can present a valid:
Canadian passport; or
Trusted Traveler Program card (NEXUS, SENTRI or FAST); or
Enhanced Driver’s License as issued in in British Columbia, Manitoba, Ontario, and Quebec, prior to the program being discontinued.
Note: The Enhanced Driver's License (EDL) allows you to re-enter the U.S. from Canada, Mexico and the Caribbean. The EDL is only accepted at land and sea border crossings, not for air travel.