https://immigrationworkvisa.wordpress.com/2017/01/24/green-card-holders-who- stay-out-of-u-s-at-risk/ Lawful Permanent Residents who stay outside of the U.S. for a few months at a time, or travel abroad repeatedly, can be at risk of losing their I-551 Green Card (Lawful Permanent Residence) to airport immigration officials when they try to re-enter America. The airport officers keep track of absences in their computers and are allowed to put green card holders in ( locked) secondary inspection at the airport upon their re-entry and ask many questions about why they left the USA so much. Many of the airport immigration officers don’t like it when green card holders take longer or repeated trips. They feel that the green card is for people who want to live in the USA full time.