Security as a principle of war.

It’s not sheer bloody-mindedness that causes captured spies to be shot in wartime. Information can usually be calculated in lives saved or lost. If you know what the enemy is up to while concealing your own plans, your chances of success increase immensely.
The crucial Battle of Midway in 1942 was won largely because the United States had broken the Japanese codes. The Japanese, however, knew little of the the U.S. forces’ deployment, of that the Americans were reading their coded messages. Good security capability enables you to achieve the most crucial of combat advantages—surprise.

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