Y36.7X - War operations involving chemical weapons and other forms of unconventional warfare Y36.7 - War operations involving chemical weapons and other forms of unconventional warfare Y36.7X - War operations involving chemical weapons and other forms of unconventional warfare Y36.7X0 - War operations involving chemical weapons and other forms of unconventional warfare, military personnel Y36.7X1 - War operations involving chemical weapons and other forms of unconventional warfare, civilian