This is a specialized procurement for a flight-critical part that requires existing Government source approval prior to contract award. The Government intends to negotiate with only one pre-approved source, but all responsible sources may submit proposals or statements of capability. Proposals received within 45 days of the synopsis publication will be considered by the Government. Interested parties must submit specific source approval information detailed in the NAVSUP WSS brochures along with their proposal. The notice clarifies that this is not a request for competitive proposals, and a determination to compete the requirement will be at the Government's discretion.