If you are in a war zone you need to know what the effects of these agents are and what victims of the different agents look like. One clue, turning blue, unconscious, and having seizures, you are too close already.
They are just everyday people just trying to offer any kind of help at all. Do you honestly think they have real professionals just hanging around a war zone? Geez, get a grip on the reality of what they are facing, not you in whatever city, town or village you live in with the safety and comfort of knowing that dialing 911 results in help getting there in minutes instead of seconds when milliseconds count.