DDG Mod

The DDG Modernization (DDG MOD) Program is a comprehensive Navy initiative under Budget Line Item (LI) 0900 designed to upgrade in-service Arleigh Burke-class (DDG-51) destroyers across Flight I, II, and IIA variants. The primary objective is to ensure these ships remain operationally relevant and tactically competitive by integrating new technologies, addressing obsolescence, and enhancing both Hull, Mechanical, and Electrical (HM&E) systems and Combat Systems.

The modernization effort is phased, with DDG MOD 2.0 representing the latest enhancement. This phase focuses on Integrated Air and Missile Defense (IAMD) capabilities, advanced radar, and electronic warfare improvements.

HM&E Modernization includes several subcomponents such as the Gigabit Ethernet Data Multiplexing System (GEDMS), Machinery Control System (MCS/DCS), Digital Video Surveillance System (DVSS), Shipwide Interior Wireless Communication System (SIWCS), and the Integrated Bridge & Navigation System (IBNS). These upgrades replace legacy systems with Commercial Off the Shelf (COTS) technologies, improving reliability, reducing manpower requirements, and supporting future technology insertions. GEDMS replaces obsolete copper LAN infrastructure with Ethernet-based systems, while IBNS enhances navigation safety and operational flexibility.

Combat Systems Modernization is a central focus, with upgrades to the Aegis Weapon System (AWS), installation of the SPY-6(V)4 Air and Missile Defense Radar (AMDR), and integration of the SLQ-32(V)7 Surface Electronic Warfare Improvement Program (SEWIP) Block III. The AWS upgrades enable simultaneous Ballistic Missile Defense (BMD) and Air Defense operations, leveraging AEGIS Open Architecture and Multi-Mission Signal Processor (MMSP) technology. The SPY-6(V)4 radar replaces the legacy SPY-1 arrays and is fielded alongside SEWIP BLK III to address emerging international threats.

Supporting Systems and Installations include upgrades such as the MK 160 Mod 15 Gun Weapon System, Multi-Mission BMD Capability Cards, Vertical Launch System (VLS) modifications, and the AN/SQQ-89(V)15 sonar suite with Multi-Function Towed Array (MFTA). These systems are procured and installed to maintain compatibility with evolving missile systems, improve anti-submarine warfare capabilities, and ensure the ships can fully support modern naval operations. Installation efforts are managed through Firm Fixed Price contracts and require multi-year funding for planning, material procurement, and shipyard work.

Additional Upgrades and Congressional Adds address specific reliability and safety issues, such as the High Efficiency Super Capacity (HES-C) Chillers for improved cooling, Officer of the Deck Screen replacements for standardized alarm panels, and new water purification systems to mitigate supply chain and hazardous material concerns. Congressional adds also support artificial intelligence initiatives for shipboard training, smart valve fire suppression systems, and mobile seamanship trainers, reflecting evolving operational and training needs.

Land-Based Engineering Sites (DM002) are funded to provide shore-based facilities for pre-installation testing and crew training, ensuring that new systems are validated and crews are proficient before deployment. Other supporting activities include Combat System Ship Qualification Trials (CSSQT) and Aegis Modernization Testing (AMT), which are required by Navy policy to verify the performance and integration of new combat systems through live-fire and operational testing.

The DDG MOD line item is justified by the need to extend the service life and combat effectiveness of the DDG-51 fleet, maintain interoperability with new ship construction, and address obsolescence and reliability challenges. The FY 2026 budget request supports procurement, engineering, installation, and testing activities, with a focus on delivering advanced combat capabilities and ensuring the readiness of the Navy's surface combatant force in alignment with strategic defense objectives.