SAN DIEGO, Calif. (FOX 5/KUSI) — The U.S. Marine Corps (USMC) has determined that a “one-in-a-million” malfunction caused an artillery shell to explode over Interstate 5 and strike a California Highway Patrol vehicle with debris last year.
The incident occurred in October 2025 during an event celebrating the USMC’s 250th anniversary.
The findings come from a newly released Marine Corps report that’s over 600 pages long…