Hereford, England—Two SAS instructors face court-martial over the death of three trainees.

The deaths occurred during the summer selection course in 2013.

On that day, Cpl James Dunsby, L. Cpl Craig Roberts, and Trooper Edward Maher died of heat exhaustion during a 16-mile march, in the Brecon Beacons, Wales.

It was the hottest day of the year.