Green-Card holders who've been allowed entry to the US after a long absence
I first entered the US in July 2014 to activate my green card. I applied for a re-entry permit and I then left in September 2014. My re-entry permit was eventually granted and I picked it up at the London Consulate in about November 2014. Interestingly, the consular officer told me that I could stay out of the US with the re-entry permit for two years from the date of its issuance (which was about two months after I had actually left the US).