Clarity
An order that has to be interpreted has already failed.
A police organisation executes through people who are frequently alone, often at night, and rarely able to seek clarification. Whatever ambiguity exists in an instruction at the top is resolved — unpredictably — by the officer at the bottom.
Clarity therefore means more than plain language. It means that priorities are ranked rather than merely listed, that the boundary of discretion is stated, and that the standard by which the work will be judged is known in advance rather than discovered afterwards. A force told what matters most can decide sensibly when two demands collide; a force told that everything matters will decide by chance.