PTSD

They can still remember the sound of guns firing at their heads. Explosions sounding in the distance, and right next to them. Of people screaming in agony from their wounds.

They can still remember the sight of craters being created instantly. People falling when they pulled their triggers, and their friends falling when the enemy pulled theirs. The light in their eyes swallowed up by the black.

Some of them had died from the guns. Some of them had died from the explosions. But more of them die from the sounds and sights, even if their bodies continue to live.