HMNZS Aotearoa, formerly the Maritime Sustainment Capability project, is an auxiliary ship of the Royal New Zealand Navy. Builder Hyundai Heavy Industries delivered the ship to the Navy in June 2020, and she was commissioned into service on 29 July 2020. Full operational capability was expected to be achieved in 2021. The vessel will serve as a replenishment oiler, and has replaced HMNZS Endeavour, the Navy’s last fleet oiler, which was decommissioned in December 2017.

The New Zealand Defence Force is the three-branched military of New Zealand. The NZDF is responsible for the protection of the national security of New Zealand and her realm, promoting its interests, safeguarding peace and security, as well as supporting peacekeeping and humanitarian missions. It consists of three services: the Royal New Zealand Navy (RNZN), the New Zealand Army and the Royal New Zealand Air Force (RNZAF), as well as 'tri-service' components. As of June 2023, the NZDF has a strength of 14,996 employees, consisting of 8,669 regular force personnel, 3,260 reserve force personnel and 3,067 civilian members. It is supported by the New Zealand Ministry of Defence (MOD) and is commanded by the Chief of Defence Force (CDF).