Exactly - It's counter-propaganda.
"Fear of NBC Warfare. This theme focuses on the horrible aspects of NBC warfare and attempts to promote a feeling of hopelessness and doom. Graphic photos, films, and written materials heighten this awareness and generate fear and panic"
http: //library.enlistment.us/field-manuals/series-3/FM33-1-1/CH12.PDF
Thanks to the Anon who posted the series