DO NOT SIGN APPLICATION UNTIL REQUESTED TO DO SO BY PERSON ADMINISTERING OATH.
I declare under penalty of perjury all of the following: 1)I am a citizen or non-citizen national of the United States and have not, since acquiring U.S. citizenship or nationality, performed any of the acts listed under “Acts or Conditions” on the reverse side of this application (unless explanatory statement is attached); 2)the statements made on the application are true and correct; 3)I have not knowingly and willfully made false statements or included false documents in support of this application; 4)the photograph submitted with this application is a genuine, current, photograph of me; and 5)I have read and understood the warning on page two of the instructions to the application form.
ACTS OR CONDITIONS
If any of the below–mentioned acts or conditions have been performed by or apply to the applicant, the portion which applies should be
lined out, and a supplementary explanatory statement under oath (or affirmation) by the applicant should be attached and made a part of this application.) I have not, since acquiring United States citizenship/nationality, been naturalized as a citizen of a foreign state; taken an oath or made an affirmation or other formal declaration of allegiance to a foreign state; entered or served in the armed forces of a foreign state; accepted or performed the duties of any office, post, or employment under the government of a foreign state or political subdivision thereof; made a formal renunciation of nationality either in the United States, or before a diplomatic or consular officer of the United States in a foreign state; or been convicted by a court or court martial of competent jurisdiction of committing any act of treason against, or attempting by force to overthrow, or bearing arms against, the United States, or conspiring to overthrow, put down, or to destroy by force, the Government of the United States.
http://www.state.gov/documents/organization/79955.pdf
Note that an "explanatory" statement can be attached.