How well did Japan conceal the armament of its secret battleship?
Short answerThe recalled estimates understated Yamato's armament, while intermediate judgments could distort good photographic analysis.
NotesBritish analysts are recalled as estimating 17-inch guns for Yamato, compared with the 18-inch armament stated here. One American estimate put the guns at 15 inches. Some American photographic analysis was more accurate before intermediate intelligence staff adjusted it according to their own judgments. The criticism is that subjective expectations displaced evidence before it reached civilian leaders.