The specific origin of "very good, very powerful" turns out to be as many as five, so it really is: very good, very powerful! First, it comes from: there was a military exercise once, and a very senior official went to visit. Then he looked at the battlefield through a pair of binoculars and said: "Very good, very powerful!" It was captured by a reporter who noticed that the cap in front of the binoculars hadn't even been opened...