The U.S. Space Force (USSF) Space Systems Command (SSC) is releasing a Request for Prototype Proposal (RPP) for Ground Based Radar Digitization (GBRD). The primary objective of GBRD is to improve Space Domain Awareness (SDA) capabilities while improving mission effectiveness for Missile Warning/Missile Tracking (MW/MT) and Missile Defense (MD) by instituting a government-owned, modular open systems architecture. The program aims to modernize eight globally positioned ground-based radars, including five UEWRs, PARCS, COBRA DANE, and the Eglin Site C-6 Radar. The GBRD program will develop and demonstrate a new, common digital baseline on an initial subset of four radar sites before proceeding to rapid fielding for the remainder. • The program is an integrated acquisition enterprise founded on a unique "compete and collaborate" model. • The Government will award OTAs to multiple Offerors who will compete on their individual designs while simultaneously collaborating on the development of a common, government-owned architectural baseline. • All Offerors will operate within a single Authoritative Digital Ecosystem, with their models and designs being objectively assessed by an independent MBSE Validator. • The program aims to transform its vast data repositories into actionable intelligence, enable proactive responses to emerging threats, and optimize resource allocations.