Cattle Run Proposers Day Announcement

DARPA is hosting a Proposers Day for the Cattle Run program on November 10, 2026, from 8:00 a.m. to 5:00 p.m. EST at the DARPA Conference Center in Arlington, Virginia, with registration required by November 4, 2026; the event is restricted to U.S. citizens holding CMMC Level 2 certification with proof of current annual CMMC affirmation posted in SPRS, and is conducted at the Controlled Unclassified Information level with no foreign nationals permitted.

The Cattle Run program develops autonomous spacecraft leveraging renewable propulsion—including solar sails—to enable cost-effective cislunar constellations. Phase 1 calls for rapid development and launch of a demonstrator spacecraft below geosynchronous earth orbit within 18 months to validate renewable propulsion's ability to achieve sufficient acceleration, accurate vehicle control, and autonomous Guidance, Navigation, and Control. Phase 2 expands to multiple spacecraft demonstrating persistent cislunar access.

Registration at https://cvent.me/BVOW3V is limited to 160 attendees with a maximum of two representatives per organization. The day includes presentations on program objectives, an industry interactive exchange facilitating teaming discussions, and ten-minute one-on-one sessions with Steven Chambers, STO Program Manager, available from 1:00 p.m. to 5:00 p.m. by request during registration. Attendance requires government-issued photo identification and submission of DARPA eForm 104 (U.S. Citizenship Verification) along with CMMC UID and organization name. Attendance is free and does not constitute a prerequisite for responding to future solicitations.