Rim of the Pacific

Rim of the Pacific
Name	Rim of the Pacific
Caption	Multinational naval formation during exercise
Dates	Biennial
Location	Pacific Ocean and surrounding littorals
Type	Multinational maritime exercise
Participants	See article

Rim of the Pacific is a biennial multinational maritime exercise centered in the Pacific Ocean that assembles naval, air, and land forces from allied and partner nations for cooperative training. It emphasizes interoperability, sea control, power projection, maritime security, and combined logistics among nations from the Asia-Pacific, the Americas, Europe, and Oceania. Participating organizations, fleets, and commands rotate through surface, submarine, aviation, and amphibious components to rehearse complex joint operations.

Overview

Rim of the Pacific brings together assets from the United States Pacific Fleet, United States Indo-Pacific Command, Royal Australian Navy, Royal Australian Air Force, Japan Maritime Self-Defense Force, Japan Ground Self-Defense Force, Japan Air Self-Defense Force, Republic of Korea Navy, Republic of Korea Air Force, Canadian Armed Forces, Royal Canadian Navy, United Kingdom Royal Navy, Royal Navy of the Netherlands, French Navy, German Navy, Republic of the Philippines Armed Forces, Royal New Zealand Navy, Royal New Zealand Air Force, Singapore Armed Forces, Royal Malaysian Navy, Indonesian Navy, Royal Thai Navy, Chilean Navy, Peruvian Navy, Argentine Navy, Brazilian Navy, Mexican Navy, Panamanian National Police, Hellenic Navy, Spanish Navy, Italian Navy, Indian Navy, Royal Brunei Navy, Royal Canadian Air Force, Royal Australian Navy Fleet Air Arm, Spanish Air and Space Force, United States Marine Corps, United States Navy Carrier Strike Group, United States Coast Guard, Maritime Self-Defense Force Fleet Escort Forces, Carrier Strike Group One, Commander, Task Force 70, Task Force 59, Allied Maritime Command, NATO Shipping Centre, United States Seventh Fleet, United States Third Fleet.

History and origins

Rim of the Pacific traces roots to multinational exercises and wartime coalitions such as World War II combined operations in the Pacific Theater, lessons from the Korean War, and Cold War maritime planning under commands like Commander-in-Chief, Pacific Command and the later United States Indo-Pacific Command. The exercise was institutionalized in the late 20th century during a period of expanding peacetime partnerships involving navies whose histories include engagements at Battle of Midway, Battle of Leyte Gulf, Guadalcanal Campaign, and Battle of the Coral Sea. Early contributors included the Royal Navy, Royal Australian Navy, and Japan Maritime Self-Defense Force, with later participation by South American and European fleets following post-Cold War security dialogues like the Asia-Pacific Economic Cooperation forums and bilateral agreements such as the US–Japan Security Treaty and ANZUS Treaty.

Operations and participating forces

Operational constructs in Rim of the Pacific replicate combined-arms concepts found in historical operations like amphibious campaigns of Operation Chromite and carrier operations exemplified by Task Force 58. Exercises integrate components from the United States Marine Corps Expeditionary Unit, Amphibious Ready Group, Fleet Marine Force Pacific, Maritime Patrol and Reconnaissance Force including P-8 Poseidon and P-3 Orion units, carrier air wings from USS Nimitz (CVN-68), USS Ronald Reagan (CVN-76), and allied carriers such as HMS Queen Elizabeth (R08), while submarines include platforms like Los Angeles-class submarine, Virginia-class submarine, Karel Doorman-class frigate, Hobart-class destroyer, Arleigh Burke-class destroyer, Type 212 submarine, Scorpène-class submarine, and Sōryū-class submarine. Amphibious elements draw on doctrines validated during Operation Overlord and Leyte Gulf-era landings and involve units such as 1st Marine Expeditionary Force, 3rd Marine Division, 3 Commando Brigade, 2nd Marine Division, and marine infantry battalions from partner nations.

Command-and-control and logistics interoperability are exercised with headquarters staffs modeled on structures like Joint Task Force and coalition planning cells used in Operation Enduring Freedom (2001–2014), while fleet sustainment relies on replenishment ships comparable to USNS Laramie (T-AO-203), USNS Supply (T-AOE-6), and allied oilers. Communications and cyber defense elements reference doctrines from United States Cyber Command and allied cyber centers such as Australian Signals Directorate and NATO Cooperative Cyber Defence Centre of Excellence.

Exercises and notable events

Rim of the Pacific has featured large-scale scenarios including air defense exercises, anti-submarine warfare, mine countermeasures, ballistic missile defense, and humanitarian assistance/disaster relief rehearsals reminiscent of operations like Tomodachi, Operation Damayan, and Operation Unified Assistance. Notable milestones include first-time participation by navies such as Indian Navy and Italian Navy in specific years, integration of stealth platforms like F-22 Raptor and F-35 Lightning II, and complex live-fire drills involving guided-missile destroyers, cruisers, and submarines. Humanitarian and civil-military coordination exercises have mirrored responses to 2011 Tōhoku earthquake and tsunami and 2004 Indian Ocean earthquake and tsunami.

Geopolitical and strategic significance

Rim of the Pacific serves as a forum for signaling, deterrence, and partnership-building among treaty allies and partners, interacting with regional security architectures that include ASEAN Regional Forum, Quadrilateral Security Dialogue, and bilateral frameworks such as the US–South Korea alliance, US–Philippines Visiting Forces Agreement, and Japan–US security arrangements. The exercise provides professional engagement between forces from nations with contested maritime claims addressed in forums like the United Nations Convention on the Law of the Sea and regional disputes involving South China Sea disputes, East China Sea disputes, and Arctic transits by global navies. Participation influences defense cooperation initiatives such as joint procurement, combined training agreements, and interoperability standards endorsed by institutions like the Pacific Islands Forum and Five Eyes.

Controversies and criticisms

Critics have raised issues related to environmental impact on marine ecosystems and fisheries, citing concerns similar to debates over deep-sea mining and marine pollution conventions like MARPOL, and local protests in host regions comparable to opposition during port calls in Hawaii and Guam. Political tensions arise from participation choices and exclusions affecting bilateral relations, echoing diplomatic disputes tied to engagements like the Taiwan Strait transits and freedom of navigation operations near disputed shoals. Transparency and cost-sharing have been questioned by commentators referencing defense spending debates in parliaments such as United States Congress, Diet (Japan), Australian Parliament, and Canadian Parliament, while legal scholars have examined exercise activities in light of international law precedents from the International Court of Justice and arbitration outcomes like the Philippines v. China case.

Category:Military exercises