 Complete the following phrase:  These programs became immense and were conducted at dozens of secret sites employing up to 65,000 people. Annualized production capacity for weaponized smallpox, for example, was 90 to 100 tons. In the 1980s and 1990s, many of these agents were genetically altered to resist heat, cold, and antibiotics. In the 1990s, Boris Yeltsin admitted to an offensive biological weapons program as well as to the true nature of the 