I would like to know how much training IA does in nuclear, biological and chemical defense. Does IA expect a threat in these areas from opposing forces? I was a chemical operations NCO in the US Army for several years. As a trainer, I found it difficult to train troops at the company level because the protective equipment was cumbersome, and they did not believe the threat was significant. As an instructor of courses in NBC defense, it was an easier job, because soldiers sent to the school were selected.