Originally Published: 21 OCT 25 13:05 ET

(CNN) — The US Marine Corps is no stranger to firing live ordnance as part of 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 troops did last weekend during the Corps’ 250th birthday celebration.

The very first shell fired as part of the demonstration exploded on Saturday over the interstate, stretches of which serve as the busiest highway in America , dropping at least one shell fragment on a parked California Highway Patrol cruiser. The celebration at Camp Pendleton, California, was attended by Vice President JD Vance and Defense Secretary Pete Hegseth.

The Marine Corps is currently investigating what went wrong with the r

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