Honolulu firefighters Friday morning responded to a call for an injured U.S. Navy sailor who fell while training at Koko Crater Stairs.

HFD received a 911 call at 8:16 a.m. Friday, and responded with five units and 16 personnel, arriving on scene in 10 minutes later.

A 19-year-old sailor was exercising with his unit when he lost his footing on the way down the stairs, which are made up of the wooden ties from a former U.S. Army tramway.

The sailor’s master chief said he fell face first, tumbled down 18 steps and hit his head, causing him to lose consciousness for a few seconds. He also injured his right shin.

Three firefighters who hiked up the trail found the patient at 8:46 a.m. and placed a cervical collar on him to support his neck.

HFD’s Air 1 helicopter then transported the man to the landing zone at Koko Head District Park, where care was transferred to Emergency Medical Services.

For about the first six months of this year, 42% of HFD’s rescues have involved visitors, while 39% involved residents, according to statistics released earlier this week. Approximately 5% of rescues involved the military. The remainder was of unknown residency or homeless.