It is hereby certified that the originator considers it to be impracticable to phrase this document in such a manner as will permit a classification other than secret. The urgency of delivery of this document is such that it will not reach the addressee in time by the next available officer courier. The originator therefore authorizes the transmission of this document by registered mail within the continental limits of the United States. Joint Security Measures for the Protection of the Fleet and Pearl Harbor Base. VII, Section VI, Joint Agreements of the Joint Coastal Frontier Defense Plan Hawaiian Department and Fourteenth Naval District.
Attention is invited to the importance of the problems presented in the subject matter.
Transmission by registered mail within the continental limits of the United States is authorized.