The answer to combating military armed drone swarms is simple:
Nuke the SOBs that use them.
Dead men/women/theys don't build, deploy or use armed drone swarms.
Nuking them, in the long run, will save more lives, cost less and end conflicts sooner.
Although it may not be PC to say it these days, the aim of war is to defeat the enemy as quickly as possible...and, like it or not, the most efficient way to do that is often to kill as many of them as you can as fast as you can.
Wake The Folks Up by telling them the ugly truth about war.
Good day.