who has authority to administer oath on DA Form 2813
The "Authority to Administer Oath" block on DA Form 2823 should be filled in with the name, title, and official position of the person administering the oath. This typically includes the rank and title of a commissioned officer or a designated official authorized to administer oaths. Additionally, it may include the organization or unit they represent. This information helps to verify the legitimacy of the oath-taking process.
president
Yes. The Constitution states the exact wording to be used in the oath but does not specify that it must be done by the Chief Justice. Anyone authorized by law to administer an oath within the jurisdiction in which the oath is taken may administer the oath to the President. When Lyndon Johnson was sworn in after the Kennedy assasination the oath was administered by a justice of the peace aboard Air Force One.
Chief Justice John Roberts gave the oath to President Barack Obama.
president
Was Calvin Coolidge
Sure, when the world ends.
That really depends upon the oath. Generally speaking, judges administer them for legal purposes.
The bible is the book on which the president keeps his left hand and takes the oath.
The oath may be taken before the President, the Vice-President, the Secretary of Defense, any commissioned officer, or any other person designated under regulations prescribed by the Secretary of Defense. Active duty, reserve, guard or retired commissioned officers of the US Armed Forces may administer the oath. Officers who resigned their commissions, and were transferred to the Obligated Reserve Section (ORS) or the Non-affiliated Reserve Section (NARS), may not administer the oath. (Exception: Commissioned warrant officers in the grade of CW2, CW3 and CW4 may also administer the oath).
No. The president is not a judge of any kind.
The term duly sworn refers to having been put under oath, before an officer authorized to administer oaths, in the manner and form required by law.