Haw. Rev. Stat. § 121-11

The adjutant general may appoint and remove at the adjutant general's pleasure a deputy adjutant general, who shall have a grade no higher than brigadier general. The deputy adjutant general shall perform duties assigned to the deputy adjutant general by the adjutant general and shall act for and in the place of the adjutant general during the adjutant general's absence or disability.