(a) Acceptance and date of promotionAn officer of the commissioned corps who is promoted to a higher grade—
(1)
is deemed for all purposes to have accepted the promotion upon the date the promotion is made by the President, unless the officer expressly declines the promotion; and
(b) Oath of office
An officer who subscribed to the oath of office required by section 3331 of title 5 shall not be required to renew such oath or to take a new oath upon promotion to a higher grade, if the service of the officer after the taking of such oath is continuous.