A second soldier has died following an incident at a military firing range in Pembrokeshire.
Defence Minister Tobias Ellwood said both victims were from the Royal Tank Regiment.
Two people are still being treated for their injuries.
Mr Ellwood said: "It is with great sorrow I can confirm the death of a second soldier from the Royal Tank Regiment following yesterday's incident at Castlemartin Ranges."
The Castlemartin range is used for tanks and armoured units to carry out direct-fire live gunnery exercises.
Paramedics were called to the scene shortly after 3.30pm on Wednesday, taking two men to Morriston Hospital, Swansea, one to Heath Hospital in Cardiff and air-lifting a fourth to a Birmingham hospital.
The two other soldiers hurt were said to be in a critical condition.
A 48-hour worldwide ban was subsequently imposed on the ammunition which had been fired during the fatal training exercising.
A statement from the Royal Tank Regiment said its investigations were continuing.
The deadly incident came five years after a 21-year-old soldier died when he was shot in the head while relaxing at a safe location outside Castlemartin.
A 2013 inquest into the death of Mike Maguire heard he was hit in the temple by a single bullet after live machine gun fire was wrongly directed inland towards the safe haven.
The inquest jury ruled Ranger Maguire, a member of the 1st Battalion, The Royal Irish Regiment, was unlawfully killed.
Press Association
