The Department of Defense, through the Naval Sea Systems Command (NAVSEA), is planning to award a follow-on contract for the sustainment and modernization of the Zumwalt Combat System (ZCS) for the DDG 1000 Class, primarily to Raytheon Technologies (RTX) in Tewksbury, Massachusetts. This contract will encompass critical sustainment engineering, design, integration, testing, software development, and logistics support, with a five-year performance period consisting of one base year and four option years, anticipated to commence in Fiscal Year 2027. The ZCS is vital for maintaining the operational readiness and modernization of the Navy's advanced combat systems, and RTX is deemed the only responsible source capable of fulfilling these complex requirements without causing delays. Interested parties may submit capability statements or proposals by 3:00 PM EST on January 5, 2026, to the designated contacts, including Elaine Zhong at elaine.zhong.mil@us.navy.mil.