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Ground based defenses would have a certain advantage due to having access to more energy. That means more sensors, faster processing power and greater effective range.

https://www.thedrive.com/the-war-zone/9345/the-u-s-armys-las...

I think it's high time for schools to switch from First Robotics Competition (FRC) teams to First Robotics Countermeasure Competition teams.

Maybe you mean First Law of Robotics? (is joke, in case not obvious)

Counter-drones, obviously. One who has the most drones (most money) will win.

Directed energy is about the only thing that's going to scale as a tactical countermeasure. Pulsed laser/EMF in the joules per shot range would seemingly work with most smaller vehicles.

https://www.youtube.com/watch?v=JnoZGzLqKgE

Masers or lasers.

Or, simply, belt-fed automatic shotguns.

Self targeting guns, lasers, maybe even high pressure water cannons.