कसैलाइ थाह छ यो भनेको के हो ? P.R ले पनि यामृकन पास्पोर्ट बोक्नु पर्ने ? कि मैले कुरो नबुझेको ? Coming soon: New rules for Americans returning home. After January 8, 2007, the U.S. government will be requiring that each U.S. citizen and permanent resident leaving the country or returning to the United States by air or sea must carry a valid U.S. passport or other secure travel document such as a NEXUS Air card when used at a NEXUS Air kiosk. Effective December 31, 2007, each U.S. citizen or permanent resident leaving the country or re-entering the United States through any land, air or sea border will be required to carry a valid U.S. passport.