The Department of Defense, specifically the Department of the Navy through NAVSUP Weapon Systems Support, is seeking to procure six units of a radar receiver-transmitter (NSN: 5841-016691341, P/N: 300A380-4) under a sole source contract with Lockheed Martin, the only approved manufacturer for this item. This procurement is critical as the government lacks sufficient technical data to qualify alternative suppliers, necessitating that all proposals come from previously approved sources or include the required documentation for source approval. The items are essential for Fleet support, and any proposals that do not comply with the stipulations outlined in the NAVSUP WSS Source Approval Information Brochure will not be considered. Interested parties should direct inquiries to Dana Scott at dana.l.scott14.civ@us.navy.mil for further clarification on the proposal process.