In Papua New Guinea, the Papua New Guinea Defense Force (PNGDF) is a small and lightly armed force tasked with defense of the country and its territories against external attack, as well as internal security and socio-economic development duties; following some inter-tribal violence in Wapenamanda in early 2024, the PNGDF was given arrest powers

the PNGDF was established in 1973, and its primary combat unit, the Royal Pacific Islands Regiment (RPIR), is descended from Australian Army infantry battalions comprised of native soldiers and led by Australian officers and non-commissioned officers formed during World War II to help fight the Japanese; the RPIR was disbanded after the war, but reestablished in 1951 as part of the Australian Army where it continued to serve until Papua New Guinea (PNG) gained its independence in 1975, when it became part of the PNGDF

PNG's security partners include Australia, France, Indonesia, New Zealand, the UK, and the US; the US and PNG signed a defense cooperation agreement in 2023, which included a shiprider agreement that provides the opportunity for PNG personnel to work on US Coast Guard and US Navy vessels, and vice versa, to tackle maritime crime such as illegal fishing; the agreement also allowed the US military to develop and operate out of bases in PNG with the PNG Government’s approval (2024)