Many events in history have been changed because of covert missions undergone by the military or by secret organizations led by the government. As a result of such activities, there have been discoveries made, conspiracies disclosed, injustices done, lives killed, and governments changed as a result of keeping everything concealed from public knowledge. For better or for worse these are the 25 most top secret military operations in history.

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Operation Paperclip
Project MKUltra
Operation Anthropoid
Bay of Pigs Invasion
Operation Wrath of God
Operation Neptune Spear
Operation Valkyrie
Operation CHAOS
Project 404
Project Azorian
Acoustic Kitty
Abu Omar Case
Project Fubelt
Operation Gold
Operation Merlin
Project MKNaomi
Operation Mockingbird
Operation Kufire
Operation MIAS
Operation Washtub
Phoenix Program
Project MKOften
Project RESISTANCE
Stargate Project
Operation Ivy Bells