Every so often a book arrives that force developers cannot afford to skim, and Jack Watling’s The Arms of the Future: Technology and Close Combat in the Twenty-First Century is one of them. Watling, Senior Research Fellow for Land Warfare at the Royal United Services Institute, has spent the last decade with the British and allied militaries on force development and operational analysis, and on the actual battlefields of Ukraine, Iraq, and Mali. That combination — the analyst’s rigor and the observer’s ground truth — gives the book an authority that most ‘future war’ writing lacks. This is not speculation; it is deduction from what is already happening.
Watling’s central and provocative argument is that the twentieth-century doctrine of maneuver — and the force structures built around it — may now be obsolete. In a battlespace saturated with ubiquitous sensors and long-range precision fires, the massing and rapid movement that defined armored warfare from 1940 to Desert Storm increasingly means presenting a concentrated, easily targeted signature. What cannot be hidden can be found; what can be found can be hit. The book is a disciplined working-out of what that reality demands: how forces must disperse, deceive, and manage their signatures to survive, and how they must then re-concentrate effects — not forces — to prevail.
The book’s great strength is its narrow, deliberate focus on the tactical and sub-tactical levels of conventional land combat. Watling resists the temptation to write the sweeping everything-book; instead he drills into the specifics — sensor-fuzed munitions, autonomous weapons, ground moving-target-indication radar, laser vibrometers, electronic warfare, and the AI that ties them together — and traces exactly how each reshapes the close fight. That bounded scope is a decisive strength: it lets him move past hyperbole into the granular ‘how,’ which is precisely where force developers live. He frames the problem as five challenges of the future battlefield and then proposes the systems and structures to overcome them.
For the experimentation and requirements community, this is the book’s real value: it is a source of testable hypotheses. Watling does not merely assert that dispersion beats mass; he specifies the conditions, the enabling systems, and the trade-offs, in terms a modeling-and-simulation effort or a live experiment could actually operationalize. His analysis of how to ‘find, fix, and finish’ in a transparent battlespace — and how to avoid being found, fixed, and finished — reads like a research agenda for any battle lab. It pairs naturally with the U.S. Marine Corps’ GCE 2040 framework, also assessed on this site: where GCE 2040 states the institutional bet, Watling supplies much of the underlying analytic argument.
The critiques are matters of scope rather than substance. By design, the book is almost exclusively about conventional land operations, with tactical aviation a secondary theme; readers seeking treatment of the maritime, space, or cyber domains, or of irregular warfare, will find them only at the edges. Some will also find Watling’s prose demanding — this is a technical book that rewards concentration, not a briefing-slide summary. Neither is a flaw; both are the cost of the depth that makes the book valuable. It is a planner’s book, and it asks to be read like one.
In summary, The Arms of the Future is the most useful single volume available for thinking rigorously about the close fight to come. Watling’s field-grounded, analytically disciplined case — that survivability now precedes maneuver, and that force design must follow — deserves to be tested, argued with, and experimented against rather than merely admired. For any officer or analyst shaping the next force, it is essential, and it is exactly the kind of source that turns transformation slogans into researchable questions.