A solicitation for commercial services seeks a contractor to provide a comprehensive underwater spaceflight analog training and testing capability, including all infrastructure, personnel, equipment, materials, food, supplies, and operational support for multi-day subsea missions. The acquisition falls under FAR Part 12, with NAICS code 541715 and a 1,000-employee size standard. Offers will be evaluated based on technical acceptability, past performance, and price, in descending order of importance. The government will award to the responsible offeror whose conforming offer is most advantageous, price and other factors considered. The solicitation includes trade agreement provisions and requires offerors to state their size status.