USX-1 Defiant
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USX-1 Defiant

DARPAUnited States🇺🇸
MilitaryMUSVsurfaceactive

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Overview

No-Manning-Required-Ship demonstrator built for long autonomous missions without humans aboard.

USX-1 Defiant is a military MUSV platform developed by DARPA in United States. No-Manning-Required-Ship demonstrator built for long autonomous missions without humans aboard. It is positioned for long-endurance autonomous operations, sea experimentation, and NOMARS concept validationand is listed publicly as active. Published specifications captured in this database include a published length of about 54.86 m and payload information listed as 240-metric-ton lightship demonstrator. The platform is described as autonomous in terms of control and autonomy. Its concept emphasizes persistent on-water presence, modular payload integration, and lower operating burden than a comparable crewed craft. Additional context: DARPA states 180-foot length.

Primary Roles

long-endurance autonomous operationssea experimentationNOMARS concept validation

Notes

DARPA states 180-foot length.

Technical Specs

Length
54.86 m
Payload
240-metric-ton lightship demonstrator
Technical Documentation
Autonomy
autonomous
SeaDroneWorld IDSD-S-032

Data Source

Type: government program page
Verified: 2026-04-05
View Source

News mentions(1)