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Live artillery fired across I-5 during amphibious assault landing at Camp Pendleton

A premature detonation of a 155 mm artillery shell during the Marine Corps 250th anniversary exercise damaged a CHP vehicle and closed a 17-mile stretch of Interstate 5.

  • A live-fire mishap occurred during Vice President JD Vance's visit to the Marine Corps' 250th anniversary, involving a 155 mm artillery round that detonated midair over Interstate 5, as reported by the California Highway Patrol .
  • Debris from the detonation fell onto the closed freeway, striking a CHP patrol vehicle and causing a small dent and scratch, according to the CHP report.
  • No injuries were reported, and investigators recovered two pieces of shrapnel measuring approximately one to two inches long, as noted by the CHP investigation.
  • Pendleton officials announced an investigation into the airborne detonation of a 155 mm artillery round outside the designated impact area, and the Border Division urged a formal after-action review to improve coordination among agencies during events near roads.
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Marine Corps artillery mishap part of unusual firing over highway

The US Marine Corps is no stranger to firing live ordnance as part training, but it had been years — more than 70, according to one US official — since Marines had fired artillery over a stretch of the I-5 interstate in California like they did last weekend during the Corps’ 250th birthday celebration.

·Atlanta, United States
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NBC LA broke the news in Los Angeles, United States on Saturday, October 18, 2025.
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