Fundamental Research to Counter Weapons of Mass Destruction. **AMENDED and posted to grants.gov**: The latest revision is posted as Amendment 12. Potential applicants are strongly encouraged to review the Amendment in its entirety, as it updates several sections. Specifically, “ATTACHMENT 1: SPECIFIC TOPICS” now includes Basic Research Topics J1-J5, with pre-application white papers due by 11:59pm EST on 4 March 2020. ** Please note that all correspondence must be sent to the appropriate Agency contact identified in Section 7. Agency Contacts. ** Please see further amendments that followed. This posting today (20 Dec 2021) is Amendment 15.