Source: http://singapore.usembassy.gov/dual_nationality.html

While recognizing the existence of dual nationality, the U.S. Government does not encourage it as a matter of policy because of the problems it may cause. Dual nationality may hamper efforts by the U.S. Government to provide diplomatic and consular protection to individuals overseas. When a U.S. citizen is in the other country of their dual nationality, that country has a predominant claim on the person. A foreign country might claim you as a citizen of that country if (a) you were born there; (b) your parent or parents (and sometimes grandparents) are or were citizens of that country or (c) you are a naturalized U.S. citizen but are still considered a citizen under that country’s laws. (The oath you take when you are naturalized as a U.S. citizen (8 CFR 337.1) doesn’t mean the foreign country does not still regard you as a citizen of that country.) Public inquiries about the citizenship laws of other countries should be directed to the embassy or consulate of that country in the United States. 8 U.S.C. 1185(b) (Section 215(b) INA) and 22 CFR 53.1 require that U.S. citizens exit and enter the United States on a U.S. passport, with certain limited exceptions (22 CFR 53.2).

Under Singaporean law, an individual who automatically acquires Singaporean citizenship at birth retains that status even after acquiring U.S. citizenship. Singapore does not recognize dual nationality beyond the age of 21.

If you wish to renounce your U.S. citizenship, please send an email with your full name, date, place of birth, U.S. passport number and residency status in Singapore to [email protected]

Further Information:

A U.S. citizen who is a resident or citizen of a foreign country may be subject to compulsory military service in that country. Although the United States recognizes the problems that may be caused by such foreign military service, there is little that we can do to prevent it since each sovereign country has the right to enact its own laws on military service and apply them as it sees fit to its citizens and residents.

Military service by U.S. citizens may cause problems in the conduct of our foreign relations since such service may involve U.S. citizens in hostilities against countries with which we are at peace. For this reason, U.S. citizens facing the possibility of foreign military service should do what is legally possible to avoid such service.

Federal statutes long in force prohibit certain aspects of foreign military service originating within the United States. The current laws are set forth in Section 958-960 of Title 18 of the United States Code. In Wiborg v. U.S. , 163 U.S. 632 (1896), the Supreme Court endorsed a lower court ruling that it was not a crime under U.S. law for an individual to go abroad for the purpose of enlisting in a foreign army; however, when someone has been recruited or hired in he United States, a violation may have occurred. The prosecution of persons who have violated 18 U.S.C. 958-960 is the responsibility of the Department of Justice.

Although a person's enlistment in the armed forces of a foreign country may not constitute a violation of U.S. law, it could subject him or her to Section 349(a)(3) of the Immigration and Nationality Act [8 U.S.C. 1481(a)(3)] which provides for loss of U.S. nationality if an American voluntarily and with the intention of relinquishing U.S. citizenship enters or serves in foreign armed forces engaged in hostilities against the United States or serves in the armed forces of any foreign country as a commissioned or non-commissioned officer.

Military service in foreign countries, however, usually does not cause loss of citizenship since an intention to relinquish citizenship normally is lacking. In adjudicating loss of nationality cases, the Department has established an administrative presumption that a person serving in the armed forces of a foreign state not engaged in hostilities against the United States does not have the intention to relinquish citizenship. On the other hand, voluntary service in the armed forces of a state engaged in hostilities against the United States could be viewed as indicative of an intention to relinquish U.S. citizenship.

Pursuant to Section 351(b) of the Immigration and Nationality Act, a person who served in foreign armed forces while under the age of eighteen is not considered subject to the provisions of Section 349(a)(3) if, within six months of attaining the age of eighteen, he or she asserts a claim to United States citizenship in the manner prescribed by the Secretary of State.

See also information flyers on related subject available via the Department of State, Bureau of Consular Affairs home page on the internet at http://travel.state.gov. These flyers include:

QUESTIONS

For further information, please contact:

Express Mail:
Director
Overseas Citizens Services, Office of Legal Affairs (CA/OCS/L)
Overseas Citizens Services
Bureau of Consular Affairs
U.S. Department of State
4th Floor
2100 Pennsylvania Avenue, N.W.
Washington, D.C. 20037
Phone: 202-736-9110
Fax: 202-736-9111

Regular Mail
Director
Overseas Citizens Services, Office of Legal Affairs (CA/OCS/L)
Overseas Citizens Services
Bureau of Consular Affairs
U.S. Department of State
SA-29, 4th Floor
Washington, D.C. 20520

01/10/2013