Waves of drones tumbled out of the sky above Camp Atterbury, Indiana, on Tuesday, their mechanical death throes punctuating what was otherwise a quiet morning.

Why it matters: Drone swarms are a nightmare for security officials all over the world, whether they're overwhelming a Russian air base or hovering near an American airport.

How it happened: Defense contractor Epirus this week demonstrated its drone-frying Leonidas to observers from various U.S. military services and foreign countries, including some in the Indo-Pacific. • Axios was the only media on hand for the Atterbury tests, about 45 minutes south of downtown Indianapolis. • In the climax of the two-hour show, Leonidas went up against 49 quadcopters, the largest grouping it's ever faced. The "forcefield system," which wea

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