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Only for armies that have enough industry behind them to keep up drone production. We're talking 5,000+ small antipersonnel FPV drones per day and 100+ Lancet class drones per day, minimum, for a conflict like Ukraine.

On top of that, you'll need drone defenses, most of which will be interceptor drones. Several hundred per day, plus millions up front to stock the battle lines. Plus all the tiny radars and sensors to know when to launch them.

Likely those numbers would be much higher against a prepared and advanced enemy, like China or Iran.