The document outlines the Justification and Approval (J&A) for an 18-month extension of Contract Number N61331-20-C-0018 with YSS, requested by the Office of Naval Research Special Projects. This extension is needed to execute unplanned tasks involving the striking, dry docking, demilitarization, and hazardous waste removal for the FSF-1 Class ship. The extension is essential as YSS is currently the only contractor familiar with the vessel, having operated and maintained it for four years. Failure to extend the contract would lead to significant delays (15-18 months) and unnecessary costs (estimated at $900,000 to $1,800,000) due to the need for another contractor to be mobilized and trained. The document asserts that introducing competition at this stage is not practical and the anticipated costs are deemed fair and reasonable. No plans exist for future competition unless a new viable source emerges. The document concludes with certifications confirming its accuracy and legal sufficiency while seeking approval for the procurement using other than full and open competition based on the outlined justified circumstances.