A Sources Sought Notice is being issued for LENS, OPTICAL INSTRU under NSN 6650-01-444-1212. This is for a potential Long-Term Contract (LTC) solicitation with a 3 year base period and 2 option years ... A Sources Sought Notice is being issued for LENS, OPTICAL INSTRU under NSN 6650-01-444-1212. This is for a potential Long-Term Contract (LTC) solicitation with a 3 year base period and 2 option years for a total of 5 years. Please review the attached Market Survey Questionnaire and Spreadsheet. Please return completed documents to Anna Douglass at anna.douglass@dla.mil if you are interested.