Re: Flak
"The ZSU was designed for AA not anti-armour, and most if not all modern IFVs are supposed to resist rounds that small."
True... But I reckon vanilla 23mm HEI-T rounds would still be overkill against drones. They point about mentioning post-war AA units was to show that it is possible to make small(ish) rounds that self-destruct to minimize the collateral damage on the ground. I really wouldn't want a ZSU-23 anywhere near Gatwick.