32 C.F.R. § 516.26 – Unsworn declarations under penalty of perjury.

(a) General. Under the provisions of 28 U.S.C. l746, whenever any matter is required or permitted to be established or proven by a sworn statement, oath or affidavit, such matter may also be established or proven by an unsworn written declaration under penalty of perjury. Because such declaration does not require a notary or other official to administer oaths, individuals preparing statements for use in litigation should consider using this format. (See figure C-3, appendix G, of this part).
(b) When executed within the United States. Place the following at the end of the witness statement:
I declare under penalty of perjury that the foregoing is true and correct. (28 U.S.C. 1746). Executed on (Date) (Signature)
(c) When executed outside the United States. Place the following at the end of the witness statement:
I declare under penalty of perjury under the laws of the United States of America that the foregoing is true and correct. (28 U.S.C. 1746). Executed on (Date) (Signature)