What does T-Day mean in Military?

This page is about the meanings of the acronym/abbreviation/shorthand T-Day in the Governmental field in general and in the Military terminology in particular.

Effective Day Coincident With Presidential Declaration of A National Emergency and Authorization of Partial Mobilization

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What does T-Day mean?

Training Expansion Day; the effective day coincident with Presidential declaration of national emergency and authorization of partial mobilization (not more than 1,000,000 personnel exclusive of the 200,000 callup).

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"T-Day." Abbreviations.com. STANDS4 LLC, 2017. Web. 22 Oct. 2017. <http://www.abbreviations.com/term/594264>.