Sustaining U.S. Army Operations in the Indo-Pacific

Potential Roles of Allies and Partners

Michael J. Mazarr, Duncan Long, Derek Eaton, Jeffery Broughton, Joslyn Fleming, Dan McCormick, Joshua Simulcik, Aaron C. Davenport, David Zielinski, Tyler Liggett, et al.

ResearchPublished Jun 5, 2025

Previous research has identified that logistics and sustainment shortfalls are a critical barrier to U.S. operational success in the Indo-Pacific. In this report, the authors identify five case countries (Australia, Japan, the Philippines, Singapore, and South Korea) and assess their potential to support key logistics and sustainment activities. In their assessment, the authors focus on each case country’s commercial capabilities to provide essential logistical supplies, commercial maritime capabilities, and fuel production and consumption capacities. The authors also catalog some of the practical and political barriers to the provision of such support.

The purpose of the authors’ analysis was to conduct an initial examination and generate a first set of insights and recommendations. These initial findings suggest that existing Army logistics and sustainment efforts in the Indo-Pacific face substantial challenges that cannot be overcome on their own, allies and partners will have to overcome political and legal barriers to provide logistical and sustainment support, and the legal and contractual basis for multilateral logistics and sustainment support in this region remains weak. However, there are areas where the Army could receive critical support (such as food and fuel), and the case countries reviewed could provide modest assistance with intra-theater maritime lift requirements. Thus, the authors recommend that the Army conduct further analysis of ally and partner capacities and existing agreements, identify highest-priority categories for multinational support, expand contracting capabilities, include multinational logistics as a major component of future theater exercises, and invest in added sustainment capabilities in the theater.

Key Findings

  • Army logistics and sustainment efforts in the Indo-Pacific face substantial challenges and, given constraints on resources, equipment, and force structure, these efforts alone are unlikely to close identified gaps.
  • Any ally or partner logistical and sustainment support will have to overcome political and legal barriers.
  • There are demonstrable areas, notably in food and fuel, where Army units operating in certain partner or ally nations could get critical support from the host government.
  • The legal and contractual basis for multilateral logistics and sustainment support in the Indo-Pacific remains weak.
  • The prospect for allied and partner sustainment support outside the home countries is limited.
  • The allies and partners reviewed for this analysis could have relatively modest abilities to support U.S. intra-theater maritime lift requirements.

Recommendations

  • The Army or U.S. Army Pacific (USARPAC) should conduct a deeper analysis of ally and partner capacities and existing agreements.
  • USARPAC should identify highest-priority categories for multinational support.
  • The Army should expand USARPAC and U.S. government contracting capabilities and generate clear requirements to empower the search for additional vendors and enable wartime contracting.
  • USARPAC should include multinational logistics as major component of all future theater exercises.
  • USARPAC should study the potential for a multinational logistics center of excellence.
  • The Army should invest in added sustainment capabilities in the theater.

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Mazarr, Michael J., Duncan Long, Derek Eaton, Jeffery Broughton, Joslyn Fleming, Dan McCormick, Joshua Simulcik, Aaron C. Davenport, David Zielinski, Tyler Liggett, and Jack Lashendock, Sustaining U.S. Army Operations in the Indo-Pacific: Potential Roles of Allies and Partners. Santa Monica, CA: RAND Corporation, 2025. https://www.rand.org/pubs/research_reports/RRA2434-3.html.
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