Australia gave Papua New Guinea four vessels, and gave an additional eighteen vessels to neighboring countries in the Pacific Forum. Australia gave these vessels to her smaller neighbors after the United Nations Convention of the Laws of the Sea established that maritime nations had 200km (100miles) exclusive economic zone. Australia gave these vessels so its neighbours could police their own sovereignty.
Australia designed the vessels using commercial off-the-shelf technology, so small countries would find them easier to maintain, in small remote shipyards. Australia fully equipped the ships, prior to delivery, with the exception of providing armament, but they are capable of mounting an autocannon on the foredeck.
Rabaul and her sister ships played a role in the Bougainville conflict.
Australia started building a new, larger, and more capable class of patrol vessels, to replace the Pacific Forum class. Rabaul was replaced by, in December 2018.