32 U.S.C. § 304

Each person enlisting in the National Guard shall sign an enlistment contract and subscribe to the following oath: “I do hereby acknowledge to have voluntarily enlisted this __ day of ____, 19_, in the ______ National Guard of the State of ______ for a period of __ year(s) under the conditions prescribed by law, unless sooner discharged by proper authority. “I, ________, do solemnly swear (or affirm) that I will support and defend the Constitution of the United States and of the State of ______ against all enemies, foreign and domestic; that I will bear true faith and allegiance to them; and that I will obey the orders of the President of the United States and the Governor of ______ and the orders of the officers appointed over me, according to law and regulations. So help me God.” The oath may be taken before any officer of the National Guard of the State or Territory, or of Puerto Rico, or the District of Columbia, as the case may be, or before any other person authorized by the law of the jurisdiction concerned to administer oaths of enlistment in the National Guard.