A plan to fire live artillery shells over a major Southern California highway as part of a military showcase attended by Vice President JD Vance has drawn strong objections from Gov. Gavin Newsom. The Democrat says the exercise is potentially dangerous and has forced him to close a 17-mile portion of the interstate for safety reasons. Vance and U.S. Marine officials at Camp Pendleton have said there is nothing unsafe about the artillery exercise and no need to disrupt traffic on Interstate 5, which is the main highway along the Pacific coast between San Diego and Los Angeles. Vance and Defense Secretary Pete Hegseth are visiting Camp Pendleton o celebrate the Marine Corps’ 250th anniversary.