An investigation is underway into the death of two servicemen on a training exercise in the Brecon Beacons on Saturday.
No live ammunition was involved and a military source suggested the personnel had "succumbed" to the conditions on the hottest day of the year.
This video report is by ITV News' Ben Chapman:
Emotional tributes have been paid to a third army reserve soldier who died from injuries sustained during SAS selection training.
One of two Army reservists killed in a military exercise in the Brecon Beacons on Saturday has been named as Lance Corporal Craig Roberts.