Nope. We dismantled our last binary chemical weapons about 15-20 years ago; we've NEVER had biological weapons stockpiled. Bio weapons are slow-acting, unreliable, and create a long-term hostile environment for our own troops; they're more trouble than they're worth. That's why the US has done its bio research for mainly creating countermeasures to any enemy use of such weapons.
—A former NBC officer.
thank you, I think panz is confusing our research programs (to continue military-funded research on antidotes for biological agents and other pandemics), for “stockpiling weapons”