[Raellus]

@Vespers: Thanks. Those examples were all pretty limited in scope and scale. Most, if not all, of those uses appear to be primarily area-denial in nature- i.e. not intended to cause mass casualties, but to keep territory and resources out of enemy hands. Legbreaker can correct me if I'm wrong, but I took his OP to mean large-scale usage, for example, against major population centers or troop concentrations.

@Chalkline: A Google search doesn't turn up much in the way of conclusive evidence that this is true. The only things in abundance are allegations and counter-allegations leveled by and at both sides, and some circumstantial evidence (a few cases of atypical diseases in North Korea and China), all of it steeped in intense Cold War-era mistrust and propaganda.

It could be true, but the threshold for evidence is too low to conclude that American BW use is "almost certain" to have occurred. Even if the allegations of US BW use in Korea are valid, it appears that it was very limited in scope and scale, and more experimental than tactical/strategic in nature.

@All: The T2KU belongs to everyone, so if you want to include BW in your campaign setting, I don't presume to tell you that you shouldn't. I think limited, small-scale, localized use of certain, not-especially-virulent agents (like those Vespers mentioned) are fairly likely. However, IMHO, military use of something like Smallpox or Pneumonic Plague make the T2KU too deadly and depopulated to be a viable play setting.

-