Fox Tail

The Fox Tail program, solicitation DARPA-PS-26-136, is a classified effort operating at the SECRET level managed by the Defense Advanced Research Projects Agency. The program seeks innovative theoretical and computational modeling approaches for extreme-scale hydrodynamics, specifically focusing on first-principles-based closures of fluid motion to address high amplitude wave propagation, very high Reynolds number flows, and abrupt phase changes in seawater. This initiative utilizes an Other Transaction for Prototype agreement rather than a standard FAR-based contract, with a performance period consisting of a 12-month base period and a 6-month option period. Proposals are evaluated based on their potential contribution and relevance to the DARPA mission, as well as cost and schedule realism. Key requirements include CMMC Level 2 compliance for prime performers and subcontractors, and the submission of an OCI mitigation plan for any participating University Affiliated Research Centers. The application process involves a multi-volume submission via the DARPA Broad Agency Announcement Tool, with a final proposal deadline of January 29, 2027. Financial management is handled through the Wide Area Workflow system, with payments processed by the Defense Finance and Accounting Services office based on a milestone-driven schedule.