After December 31, 2015, visa pages can no longer be added to U.S. passports because such inserts pose vulnerabilities to both the security of the ePassport and the internal controls of the issuance process. Instead, 52-page passport books are now issued at no extra cost to U.S. citizens applying from outside the United States. Please renew your passport early to make sure you have enough blank pages for visa stamps from other countries. Keep in mind that some countries require two blank pages for entry and exit.
You may want to visit http://travel.state.gov for more information on entry, exit, and foreign visa requirements.
