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They were taken by photographer Lalage Snow who first met the soldiers from 1st Battalion the Royal Regiment of Scotland during their training.
She says the time she spent with them helped win their trust and get them comfortable in front of the camera.
Three months later Lalage travelled to meet the group in Helmand province.
She said: "I was really shocked at how different they looked: Red-rimmed eyes, beards, really gaunt and thin, brown, and full of sand.
"It really shocked me," she admits.
The photographer says she realised there were lots of good images of soldiers in Afghanistan, but they didn't show how a person could change through combat.
"That's the external manifestation of the scars they bear - it's written in their faces," she says.
As well as the physical change, she also witnessed a shift in the personality of some of the soldiers, particularly the younger ones...
...The main aim of the photos is to shed extra light on post-traumatic stress disorder (PTSD), a subject that's been covered by Newsbeat.
None of those photographed is suffering from the condition. Lalage Snow says she wanted to highlight how PTSD can emerge years after combat.
It occurs when troops are exposed to the death of colleagues and other serious battlefield experiences. The mental health problems can have a dramatic effect on wives, children and other relatives...
...my thought was picture 1 in training, picture 2 in Afghan, & picture 3 was sometime after they had arrived back home.
these kids joined the military because they want to
The photographer wants you to drink gthe Kool Aid here.