The Department of Defense, through the Defense Logistics Agency (DLA) Aviation at Oklahoma City, is seeking interested manufacturers for the production of Line Replaceable Units (LRUs) for the KC-135 Legacy Tanker aircraft. This procurement focuses on critical systems such as the Auto Pilot Control Panel and Radio Altimeter, which are essential for the Block 45 modification aimed at upgrading the aircraft’s avionics and enhancing operational capabilities through 2040. Currently, Rockwell Collins is the only known source with the necessary technical data and production expertise, and this procurement will follow the "Other Than Full and Open Competition" process under FAR 6.302-1. Interested manufacturers are encouraged to express their capabilities to Kristopher Greene at kristopher.greene.ctr@us.af.mil, with responses being voluntary and not binding on the government.