Do germancitizens need to apply the I-131 form so they can reentry USA again???

Im a german citizen,just moved here in USA & married to a Military.My husband has to go overseas for 9months and i want to go back home.I already apply for the permanent recidence,social sec.nr,etc but it still take long n still in the process.I know when i came here I dont need a visa but why do i have to apply for traveldocument(I-131) if I can go USA w/out Visa???
USCIS Hotline couldnt give me the right answers...thanx

Answer:
The difference is that now you are in the process of becoming a permanent resident of the US. Before you were just a citizen of Germany taking advantage of the Visa Waiver Program. You are kind of in limbo until you receive your I-551 (Permanent Resident Card), because you are in the process of adjusting your status in the US. If you have a passport with a temporary I-551 stamp in it and you will be returning before that stamp expires, you should be alright.
HI paul q. notice how many immigration question are asked here? and people say people still hate the usa. not by judging on this site and the canadian and uk sites too.
If you travel without it they will consider your case abandoned and you will have to start the process over again.

The immigration information post by website user , MyTend.com not guarantee correctness

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