KUALA LUMPUR — Two Malaysian military helicopters collided and crashed during a training session on Tuesday, killing all 10 people on board, the navy said. The helicopters were rehearsing at a naval base in northern Perak state for the navy’s 90th anniversary celebration next month when the accident occurred, the navy said in a brief statement. “All victims were confirmed dead on site,” it said, adding that the remains have been sent to the hospital to be identified. A video circulating on social media purported to be of the incident showed several helicopters flying low in a formation.