Sgt. Major Saman Gunan

Sgt. Major Saman Gunan wasn't abiding by any orders when he joined the effort to rescue a boys soccer team trapped in a cave in northern Thailand. The 38-year-old retired Thai Navy SEAL did so by choice.

Gunan, who was working as a volunteer, passed out underwater during an overnight mission placing extra air tanks inside the cave, along the route divers use to reach the cavern where the 12 boys and their coach remain stranded and the oxygen in the air is depleting. He couldn't be revived and was confirmed dead early Friday morning, according to Thai officials.…