[MindBender26]

"the secret weapon", were made in Iraq and designed to be launched by hand-held rocket-propelled grenades.

Probably Bio.

The amount of Chem you could put on the front of an RPG would not do much damage to NBC prepared troops, especially in vehicles designed to operate in that enviornment, such as tanks, etc.

Bio, on the other hand.... oh boy.

Suggest reading "The Cobra Event" by Richard Preston, who also wrote "Hot Zone." Cobra Event is not science fiction, it's "science fact."

Cobra Event was required reading in newsrooms all across country right after 9/11.

[GreyFriar]

One problem with bio weapons, they take time to affect the person being infected with them. On the other hand, Sarin (nerve agent) would be a quick killer of unprotected troops.