They had gunships in Afghanistan and US still lost, not sure I see your point here. Not to mention the Taliban didn't have close to the anti-aircraft capabilities that the Russian military has. AC-130s work fine for bombing defenseless hospitals, but against a force with radar, electronic countermeasures, anti-aircraft missiles, fighter jets, and all the other tools that a modern military has access to? I think the gunships would not be nearly as effective as you think