Latest figures show 20 per cent of serving members of the US military have been diagnosed with or report symptoms of post-traumatic stress disorder.
Two mothers whose sons committed suicide a week apart last month are campaigning to raise awareness of their suicide.
In the United States, suicides in the military have claimed more lives than the fighting.
Soldier Liam Smith suffers terrible mental trauma. He believes the Taliban are in his wardrobe. He's even tried to carve off his face.