VOEA Ngahau Siliva (P302) is the second of Tonga's two Guardian-class patrol vessels.

[5] After the United Nations Convention on the Law of the Sea established that all maritime nations were entitled to exercise control over a 200-kilometre (120 mi) exclusive economic zone, Australia agreed to give small patrol boats to Tonga and eleven other neighbours in the Pacific Islands Forum.

Australia delivered her sister ship, the third vessel of her class, VOEA Ngahau Koula, to Tonga on June 21, 2019.

[6][7] She was formally handed over to Tonga on 30 October 2020, at Austal's shipyard in Henderson, Western Australia.

The handover was attended by High Commissioner Princess Angelika Latufuipeka Tuku’aho and Lieutenant Colonel Tevita Siu Fifita, representing Tonga, and Melissa Price the Minister for Defence Industry and Rear Admiral Wendy Malcolm, representing Australia.