Definition: (DOD) Actions to convey and/or deny selected information and indicators to foreign audiences to influence their emotions, motives, and objective reasoning; and to intelligence systems and leaders at all levels to influence official estimates, ultimately resulting in foreign behaviors and official actions favorable to the originator's objectives. In various ways, perception management combines truth projection, operations security, cover and deception, and psychological operations.
From the link above you can read about how deception plays a vital role in political and military activities.
In his Navy Day speech on October 27, 1941, Roosevelt said he had “a secret map
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