Many studies of combat experiences and their effects on the participants can be made by direct and relatively close observation either at the time or shortly thereafter. However, reasonably close contact with prisoners of war can only be had after their release.
Carr, William K.
"The Faceless POW,"
Naval War College Review: Vol. 30
, Article 7.
Available at: http://digital-commons.usnwc.edu/nwc-review/vol30/iss4/7