The Visa Section at the U.S. Embassy in Kabul is currently closed to the public due to COVID-19. We are unable to provide immigrant and nonimmigrant visa services that require an in-person appearance or interview

You can find the latest information on COVID here:  https://af.usembassy.gov/covid-19-information/

A permanent resident (called lawful permanent resident or LPR) or conditional resident (CR) who has remained outside the United States for longer than one year, or beyond the validity period of a Re-entry Permit, will require a new immigrant visa to enter the United States and resume permanent residence.  You can learn more about Returning Resident Visas on usvisas.state.gov.