In a significant advancement for naval technology, the Defense Advanced Research Projects Agency (DARPA) announced in February 2025 that Serco Inc. has successfully completed the prototype of a new uncrewed surface vessel (USV) named the USX-1 Defiant. This vessel, which has been in development since 2020, was introduced under tight security, limiting the details available about its capabilities. However, DARPA has indicated that the USX-1 could transform naval warfare as we know it.
As military operations increasingly incorporate drones, the USX-1 represents a new frontier in surface vessels under the Navy’s No Manning Required Ship (NOMARS) initiative. This program aims to create vessels capable of autonomous operation for extended periods, eliminating the need for onboard personnel and the logistical challenges associated with sustaining them.
DARPA emphasized that the USX-1 was designed “from the ground up with no provision, allowance, or expectation for humans on board.” Additionally, the agency has successfully tested automated fueling-at-sea, which would enable the vessel to remain operational without returning to port. Here’s what we know about the USX-1.
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The USX-1 Defiant
While many of the USX-1’s features remain classified, some details about its specifications have been disclosed. The vessel measures 180 feet in length and weighs 240 metric tons. An at-sea demonstration is scheduled for Spring 2025, marking a critical phase in its evaluation. Although the exact development cost is not public, Serco Inc. previously indicated that the base cost without systems was approximately $25 million. Given its design and the absence of crew, scaling up production for a fleet of similar vessels could prove significantly more economical than traditional crewed ships.
The Navy’s interest in such a vessel raises questions about its potential applications. While it remains uncertain whether the USX-1 is armed, similar USVs could serve as missile platforms, enhancing fleet air defense or engaging targets with cruise missiles. Other possible roles include logistics support or intelligence, surveillance, and reconnaissance (ISR) operations, thereby extending the operational reach of Carrier Support Groups.
The introduction of the USX-1 and its future counterparts is poised to reshape naval combat, akin to how uncrewed aerial vehicles like the MQ-1 Predator and MQ-9 Reaper have revolutionized land and air operations in the 21st century.
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