Multiple-award contract indefinite-delivery indefinite-quantity (MAC IDIQ) for discrete production, non-discrete production and other production work to support Navys four public shipyards, Trident Refit Facilities (TRFs) at Kings Bay and Bangor (TRFKB and TRFB), Naval Submarine Base New London (SUBASE New London) and Naval Base Point Loma (NBPL) in accomplishing repair, maintenance, and modernization of all submarines. The initial solicitation N00024-25-R-4321 established a MAC IDIQ framework for procuring work during Chief of Naval Operations (CNO) availabilities on SSNs. This baseline capability is now designated as Requirement 1. This solicitation N00024-27-R-4320 provides for a rolling admissions period for Requirement 1 and also incorporates two new requirements designated as Requirement 2 and Requirement 3.Requirement 2 consists of procuring work during availabilities on SSBNs and SSGNs at designated Submarine Maintenance Repair Facilities. Participating locations include Norfolk Naval Shipyard (NNSY), Puget Sound Naval Shipyard (PSNS), Pearl harbor Naval Shipyard (PHNSY), Portsmouth Naval Shipyard (PNSY), Trident Refit Facilities (TRFs) at Kings Bay and Bangor (TRFKB and TRFB), Naval Submarine Base New London (SUBASE New London) and Naval Base Point Loma (NBPL). Requirement 3 consists of procuring work during availabilities on SSNs specifically at TRFKB, TRFB, SUBASE New London, and NBPL. Existing MAC IDIQ contract holders (Requirement 1) electing to compete for Requirement 2 and/or Requirement 3 shall submit a formal proposal in strict compliance with the solicitation requirements for each applicable requirement they seek an award of. The specific requirements will be defined at the delivery order level, and will encompass efforts such as preservation, structural/non-destructive testing, shipboard work, electrical services, component repair, and engineering support. Efforts include performing drydock submarine repairs, maintenance and alterations at NNSY, PSNS and IMF, PHNSY and IMF, PNSY, TRFKB, TRFB, SUBASE New London, and NBPL and performing the repair and restoration of select critical components. Offerors are not required to have their own drydock. Work would be performed under delivery orders anticipated to be completed among MAC IDIQ awardees over a base period ending on 1 September 2030 with three additional option years concluding on 1 September 2033, previously established under N00024-25-R-4321 if all options are exercised. The contract periods were established as follows: Base Period - Contract award through 1 September 2030; Option Year 1 - 2 September 2030 through 1 September 2031;Option Year 2 - 2 September 2031 through 1 September 2032; Option year 3 - 2 September 2032 through 1 September 2033.Any new awards made because of this Request for Proposal (RFP) will follow the same contract ordering period periodicity as provided above. The Navy will include rolling admissions provisions enabling the Navy to annually announcement an interim competition for the purpose of adding additional contractors to the MAC IDIQ. The Navy has categorized each of these requirements (1, 2 and 3) to be procured under the MAC IDIQ into two tiers: Critical (Lot 1) and Non-Critical (Lot 2), as defined as follows: Critical (Lot 1) requirements consist of efforts that involve critical systems. Due to the nature of critical systems onboard the submarine the likelihood that delays in completing the work associated with these systems will have a significant impact on the overall availability schedule, the Navy will require contractors to possess capability and capacity to meet technical requirements for critical systems to be eligible for Lot 1 scope. To complete this work, awardees are expected to have the knowledge, skills, and experience necessary to compete for multiple concurrent complex availabilities on critical systems. Critical systems (Lot 1), although not all inclusive, the following is a list of the most common critical systems. All systems listed imply areas of the system and equipment requiring work certifications that are not subject to special emphasis program controls (e.g., submarine safety program (SUBSAFE), fly by wire (FBW), deep submergence systems/scope of certification (DSS/SOC).Vertical Launch Systems (VLS)Ship control systems components Torpedo tube Bow planes Sonar Dome Large vertical array Shipboard hydraulics systems Normal fuel oil tank and systems Lube oil systems on-Critical (Lot 2) requirements consist of efforts that do not involve critical systems but may include systems and equipment requiring work certifications. Lot 2 scope is expected to require fewer specialized contractor capabilities, both in terms of personnel and equipment. The Navy intends to issue Non-Critical (Lot 2) efforts under a Small Business Set-Aside.All responsible sources may submit a quotation, bid, or proposal, as appropriate, which will be considered by the agency. All responsible sources may submit a quotation, bid, or proposal, as appropriate, which will be considered by the agency. DISCLAIMER: Prior Questions and Answers documentation provided with this RFP is for information purposes only. Interested parties should carefully review the current solicitation for any changes.