--根据22 U.S.C.2714a条款和22 C.F.R 51.60(f)条款的规定,申请人如有社会安全号,在提交护照申请时必须填写该号码。如以前从未申请过社会安全号,应提交书面声明并宣誓“I declare under penalty of perjury under the laws of the United States of America that the following is true and correct: I have never been issued a Social Security Number by the Social Security Administration.”