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Any lawful permanent resident (LPR) or a conditional resident (CR) must present an admission document like special immigrant visa (obtained at consulate abroad), green card or reentry permit upon entry to the U.S. after their temporary trip abroad. In the absence of such document he/she is considered inadmissible. If the LPR or CR seeks admission to the U.S. after more than one year since her departure from USA, the green card may not be sufficient to allow them back into the United States.
Aliens who are physically present in the United States already are allowed to immigrate without leaving the United States to apply for an immigrant visa. This process is called Adjustment of Status (AOS). The USCIS will permit an application for AOS to be filed only if an immigrant visa is immediately available to the alien. Section 245(a) of the Immigration and Nationality Act (INA) governs the general AOS provisions.