# Tracking Layer Tranche 4 On-orbit Demonstrations and Operations Request for Information Canonical: https://abierto.us/opportunities/sdasn270003 - Solicitation number: SDA-SN-27-0003 - Notice type: Special notice - Status: Closed. Deadline was December 4, 2026 at 12:00 PM EST - Department: Department of Defense - Agency: Department of the Air Force - Contracting office: Department of Defense (n-DEPTOFDEFENSE) - NAICS: 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology) - Product or service code: AC13 National Defense R&D Services; Department Of Defense - Military; Experimental Development - Who can bid, by location: Anywhere in the US. Location does not limit who can bid: a product shipped to the buyer, research at the performer's facility, or work at the contractor's site. A state shown is the delivery point. - First posted: October 20, 2026 - Last posted: October 20, 2026 - SAM.gov: https://sam.gov/workspace/contract/opp/8c9ac33ec6434df3a707e489c3d6ff5a/view ## Description The Space Development Agency (SDA) is seeking information to inform future solicitations and reduce risk associated with the Proliferated Warfighter Space Architecture (PWSA) architecture acquisition and integration plans. This RFI seeks industry feedback on enhancements to its baseline Tracking Layer’s Resilient MWTD mission payloads and architecture, as well as new mission capabilities that can help the PWSA provide enhanced mission performance to detect and track more challenging targets across their full flight trajectories. Additional details, mission objectives, and architecture information are available upon request. Responses to this RFI will specifically inform SDA’s scope and design of possible short-term on-orbit demonstration(s) and future Tracking Layer tranches. Following this RFI and feedback phase, SDA plans to announce a Tranche 4 solicitation that includes both production contracts and partnership opportunities for rapid prototyping and flight demonstration(s) of new mission payloads. This Request for Information consists of Controlled Unclassified Information (CUI) and a classified addendum. Interested parties must contact SDA to receive the documents. Please send an email to ussf.pentagon ussf.pentagon.sda.mesg.sda-sn-27-0003-mbx@mail.mil with the subject line “TRKT4 RFI Content Request.” Please include: • Company Name: • Cage Code: • City, State of Company location • Email address: • JWICS email: (for classified documents) ## Open now in the same industry 127 open in NAICS 541715. - SBIR FY26 Phase I Broad Agency Announcement (68HERW26R0102), due November 8, 2026 at 11:59 PM EST. https://abierto.us/opportunities/68herw26r0102 - System of systems Technology Integration Tool Chain for Heterogeneous Electronic Systems (STITCHES) Sources Sought (STITCHES_001), due November 14, 2026 at 1:00 PM EST. https://abierto.us/opportunities/stitches001 - Synthesis and Distribution of Drugs of Abuse and Related Compounds (75N98027R00006OT), due November 20, 2026 at 1:00 PM EST. https://abierto.us/opportunities/75n98027r00006ot ## Publications - October 20, 2026: Special notice, due December 4, 2026 at 12:00 PM EST. Notice 1cd13b7660ee43ff96fe549144d7b847. https://sam.gov/workspace/contract/opp/1cd13b7660ee43ff96fe549144d7b847/view - October 20, 2026: Special notice, due December 4, 2026 at 12:00 PM EST. Notice 8c9ac33ec6434df3a707e489c3d6ff5a. https://sam.gov/workspace/contract/opp/8c9ac33ec6434df3a707e489c3d6ff5a/view ## Points of contact - ussf.pentagon.sda.mesg.sda-sn-27-0003-mbx@mail.mil --- Source: SAM.gov Contract Opportunities bulk extract. Confirm deadlines on SAM.gov before responding. Cite https://abierto.us/opportunities/sdasn270003.