The strategic architecture of the Indo-Pacific is shifting toward a more integrated, multilateral framework as the United States and the Philippines launched their annual joint military exercises on May 6. This year’s iteration of the drills marks a significant pivot in regional security cooperation: for the first time, Japan’s Ground Self-Defense Force (GSDF) has transitioned from a passive observer role to full-scale operational participation.
The exercises, known as Salaknib, represent a deepening of the “ironclad” alliance between Washington and Manila, now expanded to include key regional partners. By integrating Japanese boots on the ground, the drills signal a move toward a “lattice-like” security structure where the U.S. No longer acts as the sole hub, but instead encourages its allies to build direct, functional military ties with one another.
Approximately 7,000 personnel from five nations—the United States, the Philippines, Japan, Australia, and Recent Zealand—are participating in the maneuvers. The scale of the engagement reflects a shared urgency to maintain a “free and open Indo-Pacific” amidst escalating tensions in the South China Sea.
Japan’s Operational Debut in Salaknib
The inclusion of the Japanese Ground Self-Defense Force is not merely symbolic. Approximately 420 Japanese personnel are engaging in live-fire drills and complex maneuvers designed to synchronize land-based operational command and control. This shift from observer status to active participant allows the GSDF to test its interoperability with both U.S. And Philippine forces in a real-world environment.
The operational shift is underpinned by a critical legal milestone: the Reciprocal Access Agreement (RAA), which entered into force in July 2024 (following negotiations that accelerated in late 2023). This “facilitation agreement” streamlines the movement of troops and equipment between Japan and the Philippines, expanding their cooperation beyond humanitarian assistance and disaster relief (HADR) to include joint combat training and security operations.
During the opening ceremony held at a Philippine Army base in the north, the appetite for this technical exchange was evident. Philippine Army Vice Commander Morados expressed a keen interest in the Japanese military’s approach, noting that Japan possesses unique, independent systems that the Philippine Army is eager to study and integrate into its own operational logic.
Strategic Imperatives and Deterrence
The expansion of Salaknib is a direct response to what Tokyo and Manila describe as an increasingly “severe” security environment. For Japan, the exercises are a way to project stability further south and ensure that maritime lanes—vital for Japanese energy and trade—remain secure.
Hideki Yamashita, the defense attaché at the Japanese Embassy, emphasized that the current geopolitical climate necessitates a coordinated effort. He noted that it is essential to enhance deterrence by coordinating with the United States and other like-minded countries in the Indo-Pacific region to counter unilateral attempts to change the status quo by force.
| Participating Nation | Role/Status | Key Objectives |
|---|---|---|
| United States | Lead Partner | Interoperability and Regional Stability |
| Philippines | Host Nation | Territorial Defense and Command Synergy |
| Japan | Full Participant | Land Operation Command & Live-fire Training |
| Australia | Partner | Multilateral Security Coordination |
| New Zealand | Partner | Regional Cooperation |
The Broader Geopolitical Context
The evolution of Salaknib occurs against a backdrop of frequent confrontations between Philippine and Chinese vessels in the South China Sea, particularly around the Second Thomas Shoal and Sabina Shoal. As Manila seeks to modernize its defense posture, the ability to call upon a network of allies—rather than relying solely on the U.S. Mutual Defense Treaty—becomes a strategic necessity.
The participation of Australia and New Zealand further cements the role of the “Quad” members and their partners in stabilizing the region. By focusing on “land operation command functions,” the exercises are preparing these forces for a variety of scenarios, ranging from archipelago defense to rapid response in contested environments.
For the Philippines, the benefit is twofold: it gains access to advanced military doctrine from the GSDF and the U.S. Army, while simultaneously signaling to Beijing that its security arrangements are expanding in both breadth and depth.
Timeline of Integration
- Pre-2024: Japan participates in Salaknib primarily as an observer, focusing on diplomatic coordination.
- September 2023: Japan and the Philippines accelerate the framework for a Reciprocal Access Agreement (RAA).
- May 6: Official commencement of the current Salaknib exercises with full GSDF operational integration.
- Current Phase: Execution of live-fire drills and command-and-control synchronization involving 7,000 troops.
The focus on “deterrence” mentioned by officials is not merely about the number of troops, but the ability of different nations to communicate and operate under a single command structure. The technical challenge of merging different radio systems, languages, and tactical doctrines is the primary goal of the current land-based exercises.
As these five nations continue their maneuvers, the focus will likely shift toward how these land-based capabilities integrate with maritime patrols and aerial surveillance, creating a comprehensive “multi-domain” defense strategy for the region.
The next major checkpoint for this partnership will be the formalization of further joint training schedules under the RAA, which are expected to increase in frequency throughout the remainder of the year. Official updates on the outcomes of the Salaknib drills are typically released by the U.S. Army Pacific and the Philippine Department of National Defense upon the conclusion of the exercise.
We invite our readers to share their perspectives on the evolving security alliances in the Indo-Pacific in the comments below.
Related reading
