it was designed for. Lyndon B. Johnson, the last Zumwalt, was being considered for the installation of a railgun in place of one of the 155 mm naval guns after the ship was built. This would be feasible because the installed Rolls-Royce turbine generators are capable of producing , enough for the electrically powered weapon. In 2021, U.S. Navy funding for railgun development ceased with no plans to continue the project. The guns will be removed and replaced with hypersonic missiles starting in 2023. Advanced Payload Module In March 2021, the Navy solicited information from the industry on how to reconfigure the Zumwalt-class ships to host Long-Range Hypersonic Weapons (LRHW). Since they would be too large to fit in the VLS tubes, it has been suggested that the two AGS, having no use since the cancellation of their ammunition, could be replaced with three-pack advanced payload modules to fulfill a conventional prompt strike deterrence role. The Navy will request FY 2022 funding to replace the 155 mm AGS turrets with Advanced Payload Modules for the Conventional Prompt Strike (CPS) hypersonic missile. The conversion would be part of the DDG 1000 Dry-Docking Selected Restricted Availability (DSRA) beginning FY 2024. The LRHW is also slated for Block V Virginia-class attack submarines (SSN). The larger tubes for the VLS will be based upon the Virginia Payload Module (VPM) used in the Virginia SSNs. The first Zumwalt-class destroyer will be ready to test the CPS in 2025. Peripheral Vertical Launch System The Mk 57 Peripheral Vertical Launch System (PVLS) is an attempt to avoid intrusion into the prized center space of the hull while reducing the risk of loss of the entire missile battery or the ship in a magazine explosion. The system consists of pods of VLS cells distributed around the ship's outer shell, with a thin steel outer shell and a thick inner shell. The design of the PVLS directs the force of any explosion outward rather than into the ship. Additionally, this design reduces the loss of missile capacity to only the affected pod. Aircraft and boat features Two spots are available on a large aviation deck with a hangar capable of housing two full-size SH-60 helicopters. Boats are handled within a stern-mounted boat hangar with a ramp. The boat hangar's stern location meets high sea state requirements for boat operations. Radar Originally, the primarily X band AN/SPY-3 active electronically scanned