Circuit card assemb- and similar replacement parts

NSN 7H-5998-012647598-GL, TDP VER 004, REF NR 6127640, QTY 6 EA, DELIVERY FOB ORIGIN. The sole source of supply for the following items is Lockheed Martin, Cage 02769. Delivery will be FOB: Source: 0001 - NSN 5998-01-264-7598 Circuit Card Assembly P/N 6127640 Quantity: 6 each 0002 - NSN 5930-01-279-1915 Circuit Card Assembly P/N 6321765 Quantity: 1 each 0003 - NSNJ 5998-01-603-2096 Circuit Card Assembly P/N 8359256 Quantity: 2 each 0004 - NSN 5998-01-603-3134 Circuit Card Assebmly P/N 8306477 Quantity: 4 each 0005 - NSN 5998-01-603-3269 P/N Module Assembly P/N 20531047-501 Quantity: 2 each 0006 - NSN 5998-01-625-4455 Circuit Card Assembly P/N 20528863-501 Quantity: 5 each 0007 - NSN 5998-01-625-9356 Module Assembly, SBC P/N 8431039-2 Quantity: 5 each The data needed to acquire/repair this part competitively is not physically available, it cannot be obtained economically, nor is it possible to draft adequate specifications or any other adequate, economical description of the material for a competitive solicitation. The rights to use the data needed to purchase/repair this part from additional source(s) are not owned by the Government and cannot be purchased, developed, or otherwise obtained. It is uneconomical to reverse engineer this part. Acquisition/Repair of this item is restricted to Government approved source(s) because the production/repair of this item involves unclassified but militarily sensitive technology (see FAR Subpart 6.3)..