What does it take to turn a troubled stealth destroyer into a long-range hypersonic strike ship? The answer is visible in the bow of USS Zumwalt. After years defined by questions around its mission and its unusual 155mm gun system, the destroyer has emerged from a major rebuild with a different purpose: carrying the Navy’s Conventional Prompt Strike weapon, a sea-based system built around the same hypersonic glide body used in the Army’s long-range missile program. The result is not a routine upgrade. It is a structural rewrite of what the ship is meant to do.
Zumwalt returned to sea in January after its first underway period since 2023, following the installation of large missile tubes capable of fielding hypersonic strike weapons. The ship had entered Ingalls Shipbuilding in 2023 to begin a refit that removed the twin Advanced Gun Systems and made room for four large missile tubes, each designed to hold three Conventional Prompt Strike rounds. That gives the destroyer a 12-missile hypersonic battery in the space once reserved for a gun concept that never found a sustainable ammunition solution.
The gun system had become the class’s central engineering dead end. Zumwalt was originally designed around naval surface fire support, with specialized long-range guided ammunition for its Advanced Gun Systems. But the ammunition program collapsed under shrinking production volume and unsatisfactory performance. As Vice Adm. Bill Merz told lawmakers in 2018, Even at the high cost, we still weren’t really getting what we had asked for. That same hearing captured the Navy’s broader conclusion: the gun effort was delaying a ship that otherwise offered substantial potential in power generation, automation, stealth shaping, and large missile capacity.
That potential now points in a different direction. The Conventional Prompt Strike weapon is tied to the 1,725-mile range disclosed for the Army’s related Long-Range Hypersonic Weapon, since the two services share major components including the Common Hypersonic Glide Body. The missile’s military value comes from a combination of speed, maneuverability, and a flight path that is harder to track and intercept than a traditional ballistic profile. On a surface combatant, that changes the geometry of naval strike warfare: a ship can remain far from defended coastlines yet still threaten time-sensitive or heavily protected targets deep inland or at long range across the sea.
There is also an industrial reason the Zumwalt conversion matters. The destroyer’s new launch arrangement closely aligns with the hardware intended for future Virginia-class submarines, making the ship a live test case for the Navy’s broader hypersonic integration effort. Capt. Clint Lawler, the Zumwalt-class program manager, said the plan is to make the ship available for testing and support initial operational capability as schedules allow. The work on the rest of the class is already moving, with Lyndon B. Johnson undergoing similar modifications and Michael Monsoor slated to follow. This is a much bigger story than one ship.
Zumwalt began as a platform built for shore bombardment and signature reduction near contested coastlines. It is now being recast as a blue-water strike vessel centered on a weapon designed for rapid, difficult-to-defend-against attack. The original concept did not disappear so much as get replaced by a mission more compatible with the ship’s scale, electrical capacity, and internal volume. In engineering terms, the rebuild shows how a compromised design can still become useful when the payload changes. In fleet terms, it places the Navy’s first hypersonic warship at the front edge of a much broader shift in long-range maritime strike.
