The first prototype in the No Manning Required Ship (NOMARS) program will begin a multimonth, at-sea testing period this spring after the vessel's construction concluded in February, according to a Defense Advanced Research Projects Agency notice.
This prototype unmanned surface vessel, the USX-1 Defiant, was built to operate for long periods of time -- up to a year -- with no human intervention or maintenance. The USV is a 180-foot-long, 240-metric-ton “lightship” that will soon begin “extensive in-water testing, both dockside and at sea,” the announcement states.
The NOMARS initiative was launched by DARPA in 2020 and is scheduled to transition to the Navy’s unmanned maritime systems program office (PMS 406) in 2025, officials said last year. Contractor Serco was selected to build the first prototype, Defiant, in 2022.
“The NOMARS program aims to challenge the traditional naval architecture model, designing a seaframe (the ship without mission systems) from the ground up with no provision, allowance or expectation for humans on board,” the DARPA notice states.
In eliminating human manning considerations from the ship’s design, NOMARS is meant to deliver advantages including size, cost, reliability, hydrodynamic efficiency, survivability to sea-state and survivability against adversaries via stealth and tampering resistance, the notice continues.
In January, the Navy and DARPA announced they had completed a first-of-its-kind sea test in which a USV was refueled without any help from onboard personnel.
The test used the USVs Ranger and Mariner to demonstrate refueling technology designed by Serco for use aboard the NOMARS Defiant. The next at-sea refueling test is expected to utilize Defiant during the upcoming sea trials.
As the NOMARS effort progresses, the Navy’s plans for operationalizing an unmanned fleet continue to evolve, with doubts emerging over the future of the Large Unmanned Surface Vessel prior to its expected transition to an official program of record in fiscal year 2027.
Following calls from lawmakers, the service is now considering funding a new Modular Attack Surface Craft (MASC) program combining elements of the Large and Medium USV programs, a service spokesperson told Inside Defense in February.