The National Aeronautics and Space Administration (NASA) is seeking to increase the indefinite-delivery indefinite-quantity (IDIQ) ceiling for the NASA Environmental and Medical Contract (NEMCON) to better meet its operational needs. This modification will involve a sole-source acquisition from HSG, LLC, due to their specialized capabilities in environmental and medical services that are critical for NASA's space and aeronautical missions. The increase in the IDIQ ceiling is necessary to accommodate rising demands and ensure the continuity of essential services, following a comprehensive evaluation of the contractor's past performance and technical proficiency. Interested organizations are invited to submit their capabilities and qualifications to Contracting Officer Anthony Islas via email by 3:30 PM Eastern Time on April 15, 2025, for consideration in this procurement process.