Interesting. I thought the extended cleanup was because the agent was derived from more stable precursors (binary agent), plus the normal overreaction to 'OMFG

Interesting. I thought the extended cleanup was because the agent was derived from more stable precursors (binary agent), plus the normal overreaction to 'OMFG NERVE GAS'. But the (not conclusive) Wikipedia says the resultant agent is potent for 'years'. I doubt that kind of chemistry stays potent for that long in the wild, but it's by no means my area to judge. I don't think it changes the strategic or tactical view, but yeah...the thought of a year persistent toxic dead zone is unpleasant.