This opportunity is restricted to SeaPort-NxG MAC holders only; no other offers will be considered. NIWC Atlantic Charleston, SC requires Navy Shore Sustainment Support (N3S) for the Engineering Services and Cyber Authorization (ESCA) Integrated Product Team, with work performed per the Performance Work Statement (PWS). The PWS and Contract Data Requirements List (CDRL) contain Controlled Unclassified Information and are not publicly available. Interested offerors must complete and submit a Non-Disclosure Agreement for each individual requiring access to those documents. SeaPort-NxG MAC holders must also register for PIEE accounts to receive solicitations and submit proposals/offers.