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Japanese Sub Sinks USS Juneau in Valiant Shield Live-Fire Test

7/1/2026

Summary

Story summary

A Japan Maritime Self-Defense Force submarine torpedoed and sank USS Juneau 200 nautical miles off Guam during Valiant Shield 2026.
The sinking gave a live-fire SINKEX to test joint cross-domain strike capabilities of United States (U.S.) and partner navies.
Rear Admiral Eric Anduze said the exercise honed lethal precision and coordination for Carrier Strike Group 5.
Before sinking, the Navy removed PCBs, mercury, petroleum and other hazardous materials from Juneau.

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Story summary

A Japan Maritime Self-Defense Force submarine torpedoed and sank USS Juneau 200 nautical miles off Guam during Valiant Shield 2026.
The sinking gave a live-fire SINKEX to test joint cross-domain strike capabilities of United States (U.S.) and partner navies.
Rear Admiral Eric Anduze said the exercise honed lethal precision and coordination for Carrier Strike Group 5.
Before sinking, the Navy removed PCBs, mercury, petroleum and other hazardous materials from Juneau.