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What does M-day stand for?

M-day stands for mobilization day (unnamed day on which mobilization of forces begins)


This definition appears very frequently

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Other Resources: Acronym Finder has 3 verified definitions for M-day

Samples in periodicals archive:

Thank you to Jerry Phelps for allowing us to use his photo of the San Diego March and Rally for Mobilization, Joseph Durago for allowing us to use his Iwo Jima...