This is a sole-source procurement for 2 units of a specific NSN part, requiring engineering source approval from the design control activity. The approved source retains essential technical data and manufacturing knowledge that are not economically available to the Government. Alternate sources must qualify through government-approved procedures. Interested parties may obtain relevant military specifications and standards from the DoD Single Stock Point in Philadelphia, PA. All responsible sources may submit capability statements for consideration, but the Government intends to negotiate with only one source.