The Department of Defense, specifically the Department of the Air Force, is seeking qualified contractors for the Fourth Gen Rocket Motor Semitrailer (RMS4) program, aimed at developing a replacement for existing rocket motor transportation systems. The procurement is focused on addressing parts obsolescence and ensuring the continued support of the Minuteman III Intercontinental Ballistic Missile system, which requires a new design and Technical Data Package to enhance the fleet's operational capabilities. Interested parties are encouraged to participate in an Industry Day at Hill Air Force Base on December 17, 2025, and must submit visitor information by December 10, 2025, to gain access. Responses to the Sources Sought notice should be directed to Torrey Boggs and Kyle Andersen via email, with a white-paper capability statement due by the specified deadlines.