"Each year almost 4,000 British service personel have some form of mental disorder diagnosed."
For an enhanced view of this page click here to install or upgrade Flash
Filmmaker and photographer David Modell was given exclusive access to soldiers on their return from active duty.
Shot by serving personnel in combat zones, catch a rare glimpse of life on the front line, as seen from a soldier's perspective.
These revealing clips filmed by soldiers on their tour of duty offer an amazing insight into life under fire and the pressures they face.