They call it asymmetric warfare: our highly sophisticated interceptor missiles – Patriots, THAADs – against Iran's low-tech drones, made of materials you can largely get at your corner hobby store.

SIR: Low-budget drones are reshaping the architecture of modern warfare in ways that were unimaginable just a decade ago. They allow combatants to engage targets with minimal human contact, reduced ...

Wladimir van Wilgenburg stands in a residential neighborhood in Erbil, in the Kurdistan region of Iraq, and points out incoming drones high in the sky. "The U.S. defense systems, as you can see, are ...