Haw. Rev. Stat. § 122A-4: Composition; enlistment; appointment.

(a) The Hawaii state defense force shall consist of persons over the age of eighteen years voluntarily enlisted or appointed therein and such members of the unorganized militia as may be enrolled therein by draft or as otherwise provided by law.

(b) The officers of the Hawaii state defense force shall be appointed by the governor.

(c) The governor shall prescribe by rules the qualifications for and terms of enlistment and appointment in the Hawaii state defense force. Persons so enlisted or appointed shall subscribe to such oath as may be prescribed by the governor.