Showing proof of international departure in 2 weeks of less
Copy of anything you mailed out originally including receipt from Post Office.
Any letter you may have received from the government regarding your application.
If you are applying for a child (15 years or younger) both parents must be present with the child. Parents must have valid I.D. (passport, drivers license, state I.D. green card). If for any reason one parent can not show up, please have that parent fill out, sign and notarize a https://eforms.state.gov/