The new strategy for defence seems to be no more big things that take too long to build, cost too much, and are hard to reconfigure. Just lots of small things that can diversify. And attack their target all at once to confuse and overwhelm the enemy. A key lesson from recent conflicts.
The conflict in Ukraine has proved the worth of small drones, including consumer quadcopters, which have carried out reconnaissance, guided artillery fire, and destroyed tanks. Such drones are currently limited by the fact that each one needs its own operator. In a swarm, however, hundreds or thousands of drones are controlled as a single unit.