It's possible the object the task wants you to destroy doesn't actually have a destroyed version. Meaning, it probably can't physically be destroyed in the game, making the task impossible to complete.

Tasks such as this one will fail a lot on Arma 2 maps.

So you have a few options. 1. You can either manually delete the task in the tasks portion of the commander tablet, and move onto the next one. 2. You can blacklist that task from showing up completely:

http://alivemod.com/wiki/index.php?title=Custom_Blacklists

3. You can request your own tasks from now on by turning auto-tasking off or 4. You can play on Altis or Stratis where most of them *should* work just fine.

The problem is that a lot of Tanoa buildings can't be destroyed in general, making that task (and Assymtric Insurgency missions as well) pretty out of the question on that map.

I agree that that in general, C2ISTAR can use some more love. Though I'm encouraged seeing as we have two new tasks now!

I'd say for now, just use the blacklist option I linked or just manually select your own when you get a feel for which ones work well and which ones don't on the map you're using.

From my experience, most of the offensive ones such as destroy patrol, destroy vehicle, HVT etc seem to work well enough on all maps. Clear the town fails a lot, as does the transport troops and destroy insurgent HQ tasks so I'd avoid those unless you notice them working well on Tanoa.