On December 20 local time, a military helicopter caught fire after making an emergency landing in Oceanside, San Diego County, California, USA. Firefighters have been dispatched for emergency firefighting, and the specific cause of the accident is currently unclear. US military personnel stated that all four crew members were unharmed, and the emergency landing site of the military helicopter was at Camp Pendleton. It is reported that Camp Pendleton is the primary amphibious training base of the US Marine Corps on the West Coast. (CCTV International News)