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One of the facts about modern (World War One and beyond) infantry combat is: if you leave people in combat for long enough they go mad. Eventually 98% of participants will become certifiably insane. The other 2% were certifiably insane already.

There are certain phases that participants go through.

From "Becoming Battlewise",

through the "Period of Maxiumum Efficency",

and into "Combat Exhaustion" (broken into several sub-phases):

 
"Period of Overconfidence / Hyper Reactive",

then pure "Hyper Reactive"

then "Emotional Exhaustion"

then "Emotional Exhaustion / Vegetative".

From "Darkness, Be My Friend" through to the end of the series, the team is basically bouncing around between the various states of "Combat Exhaustion"