Only SeaPort MAC holders are eligible for this NSWCDD follow-on requirement for technical analysis and engineering support for mission assurance, defense and commercial critical infrastructure, and their cyber and physical dependencies. This is a Sources Sought/Advance Notice for informational and planning purposes only, not a solicitation, and no proposals are being requested at this time. NSWCDD will host an in-person Industry Day on 29 Sept 2026 from 8:00 AM to 5:00 PM EST at the University of Mary Washington-Dahlgren Campus, 4224 University Drive, King George, VA 22485. Optional one-on-one sessions with government representatives are planned for 12:00 PM to 5:00 PM that day; requests must be included with registration by 5:00 PM EST on 22 Sept 2026, and virtual sessions will not be held. Attendance is voluntary, limited to two representatives per company for one-on-ones, unclassified, and not required to compete for any future solicitation.