Is it really though?
We see a lot of examples of UAV use in places like Syria and Ukraine, but in a major peer-on-peer, a Brigade still has more to worry about from a concerted attack by AH or fast jet.
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The Ukrainian crisis has been pretty close to peer on peer and UAV in swarms have been repeatedly used to seriously impressive effect. Some of the Youtube videos of pretty basic UAV footage are frightening.
This is claimed to be a bog standard, off the shelf "toy" drone...
Currently the Army gives the appearance of giving the whole problem a damn good stiff ignoring to the point of inventing an unworkable doctrine for the Strike Brigade whilst failing to supply about 9/10s of what the brigade desperately needs to even be functional