Uncrewed systems
Aircraft, ground vehicles and maritime vessels operated without a crew on board, and why larger, long-lived platforms are the focus of defence procurement.
An uncrewed system is a platform that operates without a person on board, together with the network and equipment used to control it. The United Kingdom’s Defence Drone Strategy (2024) uses a definition of this kind: the platform, the supporting network and all equipment and personnel needed to control it. It applies the term to remotely piloted and uncrewed air systems, and to ground, surface and underwater vehicles, and leaves space vehicles out. The word uncrewed is now the preferred wording in much British and allied usage, replacing unmanned.
Uncrewed is not the same as autonomous
Remote control and autonomy are separate properties. Many uncrewed systems are flown or driven by an operator through a data link. Others perform parts of their task, such as navigation or sensor management, under software control. NATO’s Autonomy Implementation Plan, summarised publicly in 2022, does not set out a single definition. It instead frames autonomy as a family of technologies and focuses on interoperable systems of systems that can handle different levels of autonomy, common standards and doctrine, and public trust. The six NATO principles of responsible use of artificial intelligence (lawfulness, accountability, explainability, reliability, governability and bias mitigation) apply to AI-enabled autonomous systems. The United States has its own directive on autonomy in weapon systems, which concerns systems that can select and engage targets, a narrower question than uncrewed operation as a whole.
Scope on this site
This entry concerns larger systems with long service lives, bought and supported as programmes. Examples in public policy documents include medium-altitude long-endurance aircraft, heavy-lift air vehicles, and large uncrewed aircraft intended to operate with crewed fighters. The UK strategy mentions the MQ-9B Protector, which replaces the MQ-9 Reaper, and heavy-lift aircraft tested from a carrier. Small, low-cost tactical drones are outside this site’s scope.
How the systems are used
Typical roles include surveillance and reconnaissance, communications relay, logistics, and mine or seabed work in the maritime domain. In combat aviation, uncrewed aircraft are being developed to fly alongside crewed jets; see collaborative combat aircraft. A system includes the vehicle, a ground or networked control element, communications, and a support chain, so costs and risks sit across all of these rather than in the airframe alone.
Why it matters for defence technology
Governments describe uncrewed systems as a way to add capacity at lower cost per platform and to place fewer people at risk. The UK strategy states an ambition to drive a growing share of force mass in the uncrewed space and sets four objectives: faster acquisition, a resilient industrial base, common digital architectures and a culture of innovation. For larger platforms the long lifecycle matters. Software updates, certification, airspace access, spares and data links must be maintained for years, which makes them programme questions rather than one-off purchases. Common architectures and interface standards, including those published through STANAG agreements, determine whether systems from different suppliers and nations can be controlled together.
What to watch
Points to follow are how control stations and data standards converge, how allied forces certify and share autonomy functions, how policy on human control evolves, and how air traffic and maritime rules adapt to larger uncrewed vehicles. Counter-measures are covered under counter-UAS.
Sources
Related: Collaborative combat aircraft · Command and control (C2) · Counter-uncrewed aircraft systems · STANAG