The bill mandates the Secretary of Defense to establish a pilot program, known as the Warfighter Traumatic Brain Injury Diagnostics Project , within 180 days of enactment. This program aims to assess the feasibility of providing support to eligible entities involved in the research, development, testing, evaluation, or production of advanced diagnostic technologies for traumatic brain injuries (TBI) affecting members of the Armed Forces, especially those sustained during operational deployments. It also seeks to directly facilitate the advancement of these safe and effective covered diagnostic technologies, including improving manufacturing processes and transitioning prototypes to production. Key activities of the pilot program include assessing diagnostic technologies to determine their capability to distinguish TBI severity, integrate with other diagnostic aids like neuroimaging or blood-based biomarkers, and enhance military readiness through improved brain health. The program will conduct research studies involving Department of Defense experts, emergency medical technicians, and service members with TBI, while also incentivizing participation from military medical facilities and civilian trauma centers. Furthermore, the Secretary may award grants to eligible entities, prioritizing those with a proven history in TBI diagnostics or involvement in the national technology and industrial base, to fund activities such as technology validation, addressing manufacturing challenges, or providing technologies for use assessments. Upon the program's termination on September 30, 2029, the Secretary must submit a report to congressional defense committees summarizing the results and determining whether to procure and adopt new diagnostic technologies, along with recommendations for their promotion. The bill authorizes an appropriation of $5,000,000 for each fiscal year from 2026 through 2029 to carry out this initiative.