directive type memorandum
One of several forms of a DoD Issuance (e.g., DoD Directives (DoDDs), DoD Manuals, DoD Instructions (DoDIs)) used to issue or change or cancel DoD policy. DTMs are usually issued when time constraints mandate such an action. DTMs do not permanently change or supplement existing issuances, and are effective for not more than 180 days from the date signed, unless extended. Ultimately DTMs are incorporated into an existing DoD issuance, converted to a new DoD issuance, reissued, or cancelled.
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