US military acronym: Originating Agency's Determination Required.
Deprecated: Declassification guidance for classified materials. Any material flagged OADR requires that the agency which originally classified the material determine whether the information can be declassified.
A popular declassification guidance during the Cold War, the use of OADR was halted by President William Jefferson Clinton in 1998. All documents with OADR guidance needed to have new guidance, or be declassified. Due to the non-existence of many originating agencies, many DOE nuclear secrets were almost declassified, until the order was modified.