The conclusion of the U.S.-led 'Valiant Shield 2026' multi-national exercise on July 1 marks a significant milestone in Japan’s rapid military evolution. During the exercise’s high-profile 'Sinking' (SINKEX) phase in the Philippine Sea, the Japan Self-Defense Forces (JSDF) deployed a sophisticated array of anti-ship weaponry against the decommissioned USS Juneau. The climax of the drill saw the Taigei-class submarine Jingei deliver a 'lethal blow' with a Type 18 heavy torpedo, demonstrating a level of offensive lethality once considered taboo under Tokyo’s post-war pacifist framework.
While the U.S. Navy framed the exercise as a demonstration of 'interoperability' among allies—including Australia, Canada, and New Zealand—regional observers, particularly in Beijing, are viewing Japan’s performance with growing alarm. The use of the USS Juneau as a target is laden with historical irony, as the original vessel of the same name was sunk by a Japanese torpedo in 1942. For Chinese military analysts, this isn’t merely a training exercise but a laboratory for Japan to refine its 'counter-strike capabilities' using long-range, offensive hardware that it cannot easily test within its own geographically constrained borders.
Japan’s participation included the light carrier Kaga and the destroyer Fuyuzuki, which tested Type 90 anti-ship missiles—weapons that outclass the standard U.S. Harpoon in range and flight profile. Experts suggest that the JSDF is using these international platforms to bridge a critical gap in combat experience. By firing live munitions at large-scale targets like the 17,000-ton Juneau, Japan is accumulating the technical data and damage-assessment metrics necessary to transform its force from a coastal defense unit into a credible expeditionary power.
Beyond technical validation, these exercises serve a deeper strategic purpose: deep integration into the U.S. 'Joint All-Domain' command structure. The focus has shifted from whether Japanese missiles can hit a target to how seamlessly they can be guided by U.S. sensors and data links. This 'deep binding' with American tactical networks allows Japan to project power under the aegis of the alliance while incrementally eroding the legal and political constraints of its 'Exclusively Defensive Defense' (Senshu Boei) principle.
This trend is not limited to Valiant Shield. Japan has recently conducted similar live-fire tests of its Type 12 land-based anti-ship missiles in Australia and the Philippines. These maneuvers are increasingly viewed as a precursor to offensive arms exports, as Tokyo looks to market its battle-tested hardware to Southeast Asian nations. Beijing has responded with sharp rhetoric, accusing Japan of 're-militarization' and warning that the ghosts of its imperial past are resurfacing under the guise of modern security cooperation.