The most common oath to fill in for public officials in the United States is the Oath of Office. This oath is a legally binding promise made by individuals assuming public office to uphold the Constitution and laws of the United States. The Oath of Office is codified in Article II, Section 1 of the U.S. Constitution and is a fundamental requirement for anyone taking a federal office.

The Oath of Office typically includes the following language: "I do solemnly swear (or affirm) that I will support and defend the Constitution of the United States against all enemies, foreign and domestic; that I will bear true faith and allegiance to the same; that I take this obligation freely, without any mental reservation or purpose of evasion; and that I will well and faithfully discharge the duties of the office on which I am about to enter. So help me God.

This oath is significant because it ensures that public officials are committed to upholding the Constitution and the rule of law. It also serves as a public declaration of their loyalty to the nation and its values. According to the U.S. Supreme Court, the Oath of Office is a solemn and formal declaration that requires the official to take an affirmative stand in support of the Constitution and against its enemies. This is crucial for maintaining the integrity of the government and ensuring that public officials are dedicated to serving the public interest.

Data from the U.S. Office of Personnel Management (OPM) indicates that the Oath of Office is a standard requirement for all federal employees. The OPM provides guidance on the administration of the oath, ensuring that it is taken correctly and in accordance with legal requirements. Additionally, the American Bar Association (ABA) has emphasized the importance of the Oath of Office, noting that it is a cornerstone of democratic governance and a symbol of the solemnity of public service.

In conclusion, the Oath of Office is the standard oath to fill in for public officials in the United States. It is a legally binding promise to uphold the Constitution and laws of the nation, ensuring that public officials are committed to serving the public interest and maintaining the integrity of the government.