Wonder if the person who wrote that article actually watched the movie.
The scenes of Sgt. James, civilian life is so brief that it hardly displays any of the "symptoms" he speaks of.
The disorientation at the supermarket can be attributed to the sudden change of the environment as well.
Also the scene in which he calls home but is unable to speak is not due to social detachment as this guy says but he's too overcome by emotion.
He takes that call after disarming a human bomb that was placed in a child that he befriended some time earlier. That this same child was killed and turned in to a bomb and that, in order to disarm it, he had to cut open the child's torso and put his hands in, hardly something anyone wants to do, made him extremely emotional. Especially as he's a father and has a young son himself. The initial plan was to blow up the human bomb instead of disarming it. But he was unable to bring himself to actually blow up the child's body. Instead, he disarms the bomb and carries the body back to the truck.
Thats why, on hearing his family's voices over the phone, that he was too overcome to speak.