The Department of Defense, through the Army Contracting Command - Redstone Arsenal (ACC-RSA), is seeking capable vendors to provide ground-based counter-surveillance and reconnaissance (CSR) capabilities against space-based threats. This opportunity is part of a multi-phase down-select announcement aimed at identifying vendors who can produce terrestrial-based CSR prototypes and possess personnel with Top Secret clearance and Sensitive Compartmented Information eligibility. The selected vendors will play a crucial role in enhancing national defense capabilities, with the potential for subsequent classified solicitations leading to Other Transaction contracts using a Commercial Solutions Opening. Interested parties must submit their responses, limited to two pages, by December 16, 2025, at 1200 Noon CST, and include essential company information such as CAGE code and type of business. For further inquiries, contact Gina Petrino at gina.a.petrino.civ@army.mil or Ernest Snyder at ernest.l.snyder2.civ@army.mil.