The Department of Defense, through the Defense Logistics Agency (DLA Land and Maritime), is seeking sources capable of manufacturing the optical instrument identified by National Stock Number (NSN) 6650013488267. The procurement is limited to approved manufacturers, specifically Optical Coating Laboratory, LLC and Excelitas Technologies Corp, due to restrictions on data availability and qualification testing. This item is critical for defense operations, and companies interested in becoming an "Approved Source" must submit a Source Approval Request (SAR) package demonstrating their manufacturing capabilities. Interested parties should contact Contract Specialist Paul Kelley at paul.kelley@dla.mil for further details and must respond by the specified deadline to be considered for this opportunity.