The United States Citizenship and Immigration Services (USCIS) has "clarified" requirements for individuals becoming naturalized citizens by stripping out the requirement of defending the United States through military service.
"Effective July 21, 2015, new guidance (PA-2015-001) in the USCIS Policy Manual clarifies the eligibility requirements for modifications to the Oath of Allegiance. Reciting the Oath is part of the naturalization process. Candidates for citizenship normally declare that they will “bear arms on behalf of the United States” and “perform noncombatant service in the Armed Forces of the United States” when required by the law. A candidate may be eligible to exclude these two clauses based on religious training and belief or a conscientious objection," an email from USCIS clarifying the requirements states (bolding is mine).
The new guidance: