They have autoinjectors filled with a mix of godawful compounds that may or may not work against a specific nerve agent.
They would still need respiratory care and immediate evacuation as they would be suffering the side effects if the antidote and still be unable to use most of thier muscles.
For soldiers a mass chemical attack of modern stuff froma. Comparable enemy is basically lethal which is the environment this stuff gets its reputation from.
Not quite urban setting at peacetime which is was never intended for
Also people seem to keep skipping over that many of this type of nerve agent were designed for assembling in final form "in the field" and that results aren't always as optimal and hence as lethal that way compared to when done in a lab - which can impact effectiveness.