a permanent resident.? I'm planning a vacation to Thailand in 4 months from now. Do i need a reentry permit? I'm only staying in thailand for 1 month. I have search and read on many sites i will need a permit but some also say i won't since the vacation is under 1 year. I have a GREEN CARD and am a PERMANENT RESIDENT of USA since 1989. This will be my first time leaving u.s. to another country. So will i need a reentry permit just for 1 month stay at thailand?