The veteran involved is Tomas Young, who is paralyzed from the chest down. He has mobility of his face neck and arms. The rest of his body is paralyzed. He can do very little for himself. This is the clip with Phil talking about the film.
As Phil says, this is just one soldier's tale. There are thousands, who have come back damaged, physically or mentally. Many, like Tomas, will have to live out their lives in the conditions which the war created in their lives.
Based on comments, I am adding two links:
AP: Staggering Number of Wounded Vets
Suicides Among Active Duty Soldiers