This is a procurement for four units of a specific part, with delivery FOB Origin. The Government will only purchase from the approved source, Northrop Grumman Systems Corp, as it lacks the data rights to procure or repair the part elsewhere. Award is contingent upon the offeror, product, or manufacturer meeting specified qualification requirements at the time of award. The Government is not using commercial item acquisition procedures for this requirement, but interested parties have 15 days from this notice to propose a commercial alternative. Documents can be obtained online via ASSIST-Quick Search or through the DODSSP in Philadelphia, PA.