“One of the more interesting and thought-provoking courses given at the Academy was the class in writing orders—the most useful English Department course Heinlein ever got. Each midshipman was given a tactical situation for which he had to write an operations order. Then everyone in the class would pick it apart, trying to find a way to misunderstand the order. This process was called “Major-Browning,” after an officer in General Ulysses S. Grant’s Civil War staff, whose sole duty was to misunderstand Grant’s orders. If the order got by Major Brown, Grant okayed it for release. At Annapolis, the Major-Brown test was pass-fail: if anyone could colorably misunderstand the order, the midshipman got a zero mark for the day. This process, with its panic-making incentive, “gave me a life-time respect for exact meaning of words and clarity of construction of sentences.””

— William Patterson, In Dialogue With His Century, Chapter 6

(This has got to be in one of Heinlein’s novels, because I knew this story long before I ever read Patterson. I just can’t remember which one. Comment below — preferably with a citation — if you know which one.)