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The Oath of Allegiance

The final step in the naturalization process is the reciting of the "oath of allegiance" by the applicant, in which he or she makes several promises upon becoming a U.S. citizen. The oath of allegiance is:

"I hereby declare, on oath, that I absolutely and entirely renounce and abjure all allegiance and fidelity to any foreign prince, potentate, state, or sovereignty of whom or which I have heretofore been a subject or citizen; that I will support and defend the Constitution and laws of the United States of America against all enemies, foreign and domestic; that I will bear true faith and allegiance to the same; that I will bear arms on behalf of the United States when required by the law; that I will perform noncombatant service in the Armed Forces of the United States when required by the law; that I will perform work of national importance under civilian direction when required by the law; and that I take this obligation freely without any mental reservation or purpose of evasion; so help me God."

In some cases, USCIS allows the oath to be taken without the clauses:

". . .that I will bear arms on behalf of the United States when required by law; that I will perform noncombatant service in the Armed Forces of the United States when required by law. . ."

From U.S. Citizenship and Immigration Services