I remember that too. I don't have the URL, but I do know that the amount of bombs needed has changed since that chart was made. The Vehicle Hanger at the Vfields are MUCH softer now. (Maybe as low as 500lbs.) From what I can tell the ack guns are very soft, a 100lbers easily kills them. 250 lbers will kill all but the hangars with a direct hit. Hangars still require 3000lbs. The city buildings appear to be 100 - 250lbs. The HQ building itself has varying degrees of damage, but 24000lbs completely blows it up for sure.