US Inquiry says it was the fault of the AC-130 crew who mistook the hospital for a government building.

http://www.bbc.co.uk/news/world-asia-34925237

I stand by my first assessment, poor discipline/training/briefing of aircrew.

On Wednesday, the US commander in Afghanistan, Gen John Campbell, said the investigation had found that the attack on the hospital was "the direct result of avoidable human error, compounded by process and equipment failures".