I don't know about the specific process of weaponizing for various specific military applications, but the endospores of anthrax will give you "anthrax pneumonia" right out of the ground, 100% natural and organic. They're hardcore little motherfuckers too. The nature of endospores is that they are hardy and tough to kill, and easy to grow, that's why they became a bioterror weapon of choice. Botulinum and anthracis spores can survive a lengthy boiling that would kill almost anything else, and they stay "good" on the shelf for years. Their method of attack is pretty Delta Force, too. They get in your lungs, get a phagocyte to take them up, ride into your lymph and then germinate (turn back from spore to vegetative bacteria) and go to town. The envelope attacks, I believe, were just concentrated spores, higher than you'd get hit with in your typical sheep field. It's hasn't really been found to be communicable from human to human, though.