This procurement is unrestricted under NAICS 541690 for other scientific and technical consulting services, with award limited to U.S. firms or individuals. Contractor and U.S. subcontractor employees must be U.S. citizens or lawful permanent residents, and subcontractor use is limited to less than fifty percent of the proposed price. The government will make a single best-value award based on the evaluation factors, and offerors must have an active SAM registration to be eligible. Questions must be submitted via email to the specified addresses only, and any contract awarded to a suspended or debarred contractor is voidable. The solicitation includes the full performance work statement and contractual sections necessary for preparing a proposal.