Next Generation Surveillance Array (NGSA) Development, Low-Rate Initial Production and Full-Rate Production. The NGSA is a passive towed twin-line acoustic sensor tailored for use within the Surveillance Towed Array Sensor System (SURTASS) Program. The proposed NGSA contract will leverage a Government-developed design that utilizes Open Architecture Telemetry (OAT) to produce a replacement multi-line array for fielding on Auxiliary General Ocean Surveillance (T-AGOS) ships and other SURTASS host platforms. The full version of this Request for Proposal (RFP) includes both Controlled Unclassified Information (CUI) and Controlled Technical Information (CTI) and will not be made publicly available. To request access to the full RFP, the following documents shall be submitted via email to Donica.L.Ryder.civ@us.navy.mil with a copy to Lindsay.L.Roa.civ@us.navy.mil.1. A signed Non-Disclosure Agreement (NDA) by each individual, and no more than two individuals per company, requiring access to the non-public documents; and2. A current, valid Military Critical Technical Data Agreement (DD Form 2345) for each company (including team members and subcontractors) requiring access to the non-public documents.NAVWAR, at its discretion, may limit the number of individuals approved for access to the CTI contained in the full version of this RFP. Only individuals granted access within a particular company may review CTI. To minimize the volume of e-mails, only one POC from the each respondent shall submit the NDAs and DD Forms 2345 on behalf of the respondent?s team (including team members and subcontractors). Upon receipt and verification of the signed NDAs and current DD Forms 2345, NAVWAR will securely transmit the full RFP to authorized individuals.