As many as 20 soldiers have died during SAS selection in the Brecon Beacons, defence chiefs have admitted.
According to figures, almost one soldier has died every two years during SAS tests in the Welsh mountain range since 1984.
Twice a year regular military personnel attempt to pass Special Forces selection in the Brecon Beacons.
Now, calls are being made for a memorial in honour of those who have lost their lives, The Mirror reports.
The proposal for a permanent monument has been put forward by a friend of one man who died during the selection process.
The unnamed soldier, who was a friend of a colleague who died while taking part in training has asked the Ministry of Defence how many have died.
In a written letter to the MoD he said: "I’ve had some discussions with local councillors and politicians about a memorial for service people that lost their life in the Brecon Beacons.
"I lost a close friend and colleague there while he was training for special force selection some years ago and it is a topic close to my heart."
Among those who died were Cpl James Dunsby, 31, L/Cpl Edward Maher, 31, and L/Cpl Craig Roberts, 24 , who died near Pen y Fan mountain in the Brecon Beacons in 2013.
Roberts and Maher died from heatstroke during a 16 mile dash and Dunsby died from organ failure during extremely hot conditions.
Cpl Joshua Hoole, 26 died in 2016 during another fitness test, triggering calls for an enquiry.
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The training takes place twice a year, with an average of 100 personnel from units all over the armed forces facing a four week long intense test, the most notorious being a 16-mile march carrying a 45 lb back pack and rifle over Pen y Fan.
The majority of military deaths in the Brecon Beacons are thought to have taken place during SAS selection or training.
A Ministry of Defence spokesperson said: "Our deepest sympathies remain with the families and friends of those who have tragically lost their lives.
"The health and safety of our personnel is a priority and we continually review training environments and methods to ensure they are as safe as possible."
