He previewed the new framework, officially called the Chemical and Biological Defense Program’s Enhanced Medical Countermeasures Approach, in an exclusive interview. It’s no longer just the special operations forces fighting terrorists who might be exposed to chemical or biological weapons deployed by regional actors such as Iran or Syria, Watson said. Now, the problem has evolved to threaten the entire force. U.S. officials are particularly concerned about adversaries that already have advanced chemical and biological capabilities and have proven themselves willing to use them. Russia and China now have the technology necessary both to tweak current threats — from toxins...