Western Hemisphere Travel Initiative - Starting on June 1, citizens of the U.S., Canada and Bermuda were required to present one of the following documents when entering the U.S. by land or sea:

• A valid passport;
• A valid U.S. passport card (U.S. citizens only);
• A Department of Homeland Security trusted traveler program card, such as a NEXUS, SENTRI or FAST program card;
• An enhanced driver's license (EDL). EDLs are driver's licenses that require applicants to provide proof of their citizenship or immigration status;
• A U.S. military identification card, with proof of military travel orders;
• A U.S. Merchant Marine Document;
• An enhanced tribal identification card, issued by some Native American tribes;