Military branches:
Tonga Defense Services aka His Majesty's Armed Forces (HMAF): Territorial Forces, Land Force (includes Tonga Royal Guards, Royal Tonga Marines, and a Combined Log and Tech Support Unit), Tonga Navy, Training Wing, Air Wing and Support Unit
(2018)
Military service age and obligation:
16 years of age for voluntary enlistment (with parental consent); no conscription; the king retains the right to call up "all those capable of bearing arms" in wartime
(2012)