Fun fact: When a unit enters a possible NBC situation, they get issued with a field test kits for chemical and biological attacks. It was basically an oversized postcard with various strips and ampules glued to the card which you could expose to air, soil or water samples.

Common glass cleaner could make the test respond as positive for nerve agents. There were a few other ways to spoof the test, but all with the thought it was better to have troops gear up into full MOPP gear for nothing than have them walk into a contaminated area.