DLA is seeking sources for NSN 5962-01-642-2641, a linear microcircuit, with Tandex Test Labs P/N TTL12003 as the approved source. The item is classified AMC/AMSC 3B, meaning it must be acquired directly from the actual manufacturer or a source specified on a source-control/selected-item drawing because suitable technical data, Government data rights, or manufacturing knowledge are not available for alternate sources. Firms interested in becoming an approved source may submit an application through DLA Weapons Support’s Alternate Offer/Source Approval Request (SAR) program. The SAR package must demonstrate that the prospective contractor can manufacture the product to at least the OEM’s quality level, with the burden on the contractor to document equivalence or superiority. Source information may be submitted directly to Contract Specialist David Hartrum, and DLA Weapons Support–Columbus is the procuring organization.