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.

​ 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. Read More Breaking News, Latest News and Videos | CNN