This is a technical position, and it is generally a very professional one, belonging to the chemical defense force. As for the danger, to be honest, it is safer than other branches of the military, and the working environment is also better. When they work, especially when they come into contact with dangerous goods, they do it in the laboratory, where protective measures are still in place, and problems will only occur unless you are extremely unlucky. But, having said that, you may fall to death while walking...

As for him not explaining it to you, this is normal. It is very difficult to explain it to you. One thing is that just explaining those chemical names is troublesome enough. It would be so boring to give you a chemistry class while you are dating.