Haw. Rev. Stat. § 121-23: Oath required.

Every person appointed or commissioned as an officer or who enlists or reenlists shall sign and take an oath of allegiance to the State and the United States, in a form as may be prescribed by the regulations issued by the commander in chief. A person making a false oath as to any statement contained in any enlistment paper or oath shall be guilty of perjury and upon conviction thereof shall be sentenced as provided by law.