The Department of Energy, specifically the National Nuclear Security Administration (NNSA), is seeking to establish a ten-year, enterprise-wide cost-reimbursement indefinite-delivery, indefinite-quantity (IDIQ) contract with the National Academy of Sciences (NAS) to provide independent scientific, technical, engineering, and advisory services. This procurement aims to support all NNSA and Department of Energy Headquarters (DOE) Program and Field Offices by delivering expert consulting services in various scientific and technical domains. The services are crucial for enhancing the effectiveness and efficiency of the NNSA's operations and ensuring compliance with national security objectives. Interested parties can reach out to Tracy J. CDeBaca at Tracy.CDeBaca@nnsa.doe.gov or call 505-845-4711 for further information regarding this presolicitation notice.