Whether a person with shell-shock was considered "wounded" or "sick" depended on the circumstances. When faced with the phenomenon of a minority of soldiers mentally breaking down, there was an expectation that the root of this problem lay in character of the individual soldier, not because of what they experienced on the front lines during the war. The large proportion of World War I veterans in the European population meant that the symptoms were common to the culture. Signs and symptoms
Combat stress reaction symptoms align with the symptoms also found in psychological trauma, which is closely related to post-traumatic stress disorder (PTSD). CSR differs from PTSD (among other things) in that a PTSD diagnosis requires a duration of symptoms over one month, which CSR does not. Fatigue-related symptoms
The most common stress reactions include:

Autonomic nervous system – Autonomic arousal
Battle casualty rates
The ratio of stress casualties to battle casualties varies with the intensity of the fighting. With intense fighting, it can be as high as 1:1. In low-level conflicts, it can drop to 1:10 (or less). Modern warfare embodies the principles of continuous operations with an expectation of higher combat stress casualties.The World War II European Army rate of stress casualties of 1 in 10 (101:1,000) troops per annum is skewed downward from both its norm and peak by data by low rates during the last years of the war.
This can be done in units in reserve positions, logistical units or at medical companies. Every effort is made to reinforce service members identity. They are required to wear their uniforms and to keep their helmets, equipment, chemical protective gear, and flak jackets with them. When possible, they are allowed to keep their weapons after the weapons have been cleared. They may serve on guard duty or as members of a standby quick reaction force. Predeployment preparation
Screening
Historically, screening programs that have attempted to preclude soldiers exhibiting personality traits thought to predispose them to CSR have been a total failure. Part of this failure stems from the inability to base CSR morbidity on one or two personality traits. Full psychological work-ups are expensive and inconclusive, while pen and paper tests are ineffective and easily faked. In addition, studies conducted following WWII screening programs showed that psychological disorders present during military training did not accurately predict stress disorders during combat. Cohesion
While it is difficult to measure the effectiveness of such a subjective term, soldiers who reported in a WWII study that they had a "higher than average" sense of camaraderie and pride in their unit were more likely to report themselves ready for combat and less likely to develop CSR or other stress disorders. Soldiers with a "lower than average" sense of cohesion with their unit were more susceptible to stress illness. Training
Stress exposure training or SET is a common component of most modern military training. There are three steps to an effective stress exposure program.