What was the contractor supposed to put in the Distribution Statement block? 'N/A'? 'DISTRIBUTION STATEMENT A. Approved for public release. Distribution is unlimited.'?
As you stated, DoDI 5320.24 does not provide guidance on when the statement is left blank. The Instruction states that one of the release/distribution codes from Enclosure 4 should be used.
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Therefore, the safe approach would be to contact the CO and have the CO request a statement (in terms of the mandatory codes) from the Contractor and modify the contract to include the proper distribution statement.