The Department of Defense, specifically the U.S. Air Force's Propulsion Directorate, is seeking information from potential contractors through a Sources Sought Notice for the Advanced Propulsion Development (APD) Indefinite Delivery Indefinite Quantity (IDIQ) contract. Interested vendors are invited to submit capability statements that demonstrate their ability to meet the program objectives across thirteen propulsion-related technology focus areas, which include advanced propulsion technologies and high-temperature solutions. This initiative aims to identify qualified vendors, including small and disadvantaged businesses, to support future propulsion technology development efforts, thereby enhancing the Air Force's capabilities in this critical area. Responses must be submitted by 3:00 PM (ET) on February 21, 2025, via the DoD SAFE platform, and inquiries can be directed to Tanner Alley or Benjamin Fink at the provided email addresses.