Bid document
Updated
A PDF document (304 KB) attached to Fox Tail, from the Defense Advanced Research Projects Agency (DARPA). Due Jan 29, 2027.
File name: DARPA-PS-26-136.pdf
The full file is for paid members, or buy this bid alone.
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Program Solicitation (PS)
Fox Tail
DEFENSE SCIENCES OFFICE
DARPA-PS-26-136
September 24, 2026
DARPA-PS-26-136
OVERVIEW INFORMATION:
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Federal Agency Name: Defense Advanced Research Projects Agency (DARPA), Defense Sciences Office
Funding Opportunity Title – Fox Tail
Announcement Type – Initial Announcement
Funding Opportunity Number – DARPA-PS-26-136
Assistance Listing Number: Not applicable
Dates/Time - All Times are Eastern Time Zone (ET):
o Classified Proposers Day: August 31, 2026
o Posting Date: September 24, 2026
o Requests for Security Classification Guidance (SCG) and Classified Addendum may be made immediately after PS posting. Note that proposers should allow at least 10 business days for processing requests and delivery of the SCG and Classified Addendum. Proposers are encouraged to make this request early, as response times may vary. DARPA is not responsible for abstract or proposal submission delays due to late requests. See Section V for additional details.
o Deadline to Notify Security of Intent to Submit Classified Abstracts: October 30, 2026 o Proposal Abstract Due Date: November 13, 2026, at 4:00 p.m. o Question Submittal Closed (Classified and Unclassified): January 13, 2027, at 4:00 p.m. o Deadline to Notify Security of Intent to Submit Classified Proposals: January 16, 2027 o Proposal Due Date: January 29, 2027, at 4:00 p.m.
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Anticipated individual awards: Multiple awards are anticipated
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Period of Performance: Fox Tail is an 18-month effort, with a 12-month Base period and a 6-month Option period.
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Types of instruments that may be awarded: Other Transaction Agreements for Prototype
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Fox Tail is a classified program operating at the SECRET level. Security classification guidance via a Security Classification Guide (SCG) and DD Form 254, “DoD Contract Security Classification Specification,” can be requested along with the Classified Addendum per the instructions below in Section V.
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NAICS Code: 541715
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Agency contact:
The PS Coordinator for this effort may be reached at:
[email protected]
DARPA/DSO
ATTN: DARPA-PS-26-136
675 North Randolph Street
Arlington, VA 22203-2114
DARPA-PS-26-136
SECTION I: FUNDING OPPORTUNITY DESCRIPTION
INTRODUCTION
The Defense Advanced Research Projects Agency (DARPA) is soliciting innovative proposals in the general area of extreme-scale hydrodynamics, including, but not limited to, high amplitude wave propagation, very high Reynolds number flows, and abrupt phase changes. Proposed
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