As Ukraine has shown, 3D printing lets soldiers quickly and cheaply build drones, make parts, and adapt designs for the battlefield.

As Ukraine has shown, 3D printing lets soldiers quickly and cheaply build drones, make parts, and adapt designs for the battlefield.

If soldiers only have a handful of drones, their usefulness in combat is limited. But dozens more increase combat power.

A recent drill saw dozens of drones targeting enemy weapons, sensors, and positions before soldiers attempted to approach.