"At the time". The most advanced NBC suits (read: JSLIST) are only good for attack against liquid aerosols for 24 hours. This isn't any better than Cold War battledress. The only thing that's improved is that the suit is easier to move in and slightly lighter. So by all accounts, everything you just said is still true?
A lot of testing from the era suggests the number then was 8 hours.
But the point is, people were at the time of the belief that they were going to invent some solution that doesn't just 'force the other battalion work in NBC gear', but actually somehow penetrates the gear and kills them. It turned out to be essentially impossible, that's to say, there are apparently near-hard limits to how deadly chemweapons can be. And people basically decided it is much cheaper and easier to drop HE-F on the battalion, tear them apart with shrapnel, etc., than to go 'oh we dropped some of our most expensive chemicals in their vague location, Comrade Colonel. I bet those Yankees won't like having to clean their tanks in full gear now!'









