The Morale Operations Branch (MO) of the Office of Strategic Services (OSS) was established in 1943 to conduct psychological warfare against the Axis powers during World War II. Its mission was to undermine enemy morale and support Allied efforts through propaganda, subversion, and misinformation. MO's activities included distributing leaflets, broadcasting demoralizing radio content, and creating forgeries to deceive enemy forces. Notable operations like Operation Cornflakes involved infiltrating enemy mail systems with Allied messages.

The branch's innovative techniques significantly impacted psychological warfare, influencing modern practices and contributing to the legacy of the OSS,

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