I'm specifically talking about small civilian-bought or home made drones, not anything intended for military purposes like the US military uses.

To make it a bit clearer what's a terrorist attack vs an attempted attack, at least one targeted person must be killed in the attack.

If the first attack happens in 20XX, then all years 20XX and above will resolve to YES. Each year will resolve NO when that year ends without an attack. If it's unclear at year's end, I'll wait for clarity before resolving that year.