Ltr Watson Labs. 14 Jun 46, subj: "Change in Class. of 'Mogul,' Item 188-5."
1st Ind. TSELT-2/WHD/mch
Hq., Air Materiel Command, Wright Field, Dayton, Ohio. 8 July 1946.
TO: Commanding General, Army Air Forces, Washington 25, D.C.
THRU: （AC/AS-4)
1. To amplify the information given in the basic letter it is desired by Electronic Subdivision that the following information and scientific data pertaining to project "Mogul" be classified "TOP SECRET:"
a. Precise data as to the exact placement of measuring instruments.
b. Scientific observations and measurements that have military application.
c. Detailed methods of measuring results.
2. Engineering preparations for the final test that are not in conflict with the above will be classified "Confidential."
3. Contractual documents will be classified the same as the security classification of the equipments involved. Equipments used in project "Mogul" are common to other systems or sets that are now classified "Confidential," "Restricted," or "Unclassified;" contractual documents should be classified accordingly.
4. Authorization is requested to observe the security classifications proposed herein.
FOR THE COMMANDING GENERAL:
E. O'DONNELL Brig.Gen.,U.S.A. Deputy Chief Engineering Division