This is a small business set-aside RFP for scientific and technical consulting services under NAICS 541690, with award limited to U.S. firms or individuals. The government will make a single best-value award based on evaluation factors, using commercial item procedures under FAR Part 12. Offerors must be registered and active in SAM to be eligible, and any contractor must not be suspended or debarred. An amendment was posted that includes questions and responses, with all other terms unchanged. The solicitation includes sections B through E covering contract clauses, a performance work statement, and instructions to offerors.