January ll, 1957 APOAT-1/SWID MEMORANDUM FOR THE CHAIRMAN, MILITARY LIAISON COMMITTEE SUBJECT: ‘(SBEREP} Exchange of Information with the British in Connection with its Megaton Weapons Trials Scheduled for the Spring of 1957 1. This office has a requirement to obtain the maximum amount of information on the U.K, megaton weapons scheduled _ to be tested in the spring of 1957. In order to have the best chance of meeting this requirement, AFOAT~1 is in the process of exploring with the U.K, Task Force the possibility of obtaining certain important information and assistance which would greatly enhance the possibility of a successful operation, 2, The information required from the U,K, is in part of the following type: a, time schedules for shots, b, location of ground gero, c, location of restricted arcas, a. actual timing signals during the bomb run, ete. The assistance required from the British is in part: & approval to operate a measurement station on an island in the vicinity of the restricted area, b, scheduling of flights of U.S, sampling aircraft in and near the vicinity of the restricted area, etc. 3. In return it is anticipated that the British may request copies of seismic, acoustic and electromagnetic recordings obtained on the British megaton shots, as well as permission to visit the station where these measurements are made, As you know the Atomic Energy Act of 1954 controls information concerning atomic energy programs of other nations, except such information as may be removed from the Restricted Data category by the joint determination of the AEG and the Director of Central Intelligence under Section li2e, In the ease of data on U.K, nuclear tests no action under Section lize has been taken, Data on such tests including seismographic, acoustic and electromagnetic records, therefore, are Restricted ata. 4, AFOAT-1 proposes to give the U.K, copies of the recordings obtained on the U.K, weapons trials in the spring of 1957 as well as additional information concerning the equipment on which this data was obtained, | Furthermore, AFOAT~1 wishes to invite British technicians in the area to visit field Stations where the seismic, electromagnetic and acoustic data are recorded. AFOAT~1 does not propose to give the U.K. the DECLAGHTErer B.C, 12868, Geo. 2.6 emer ty ™ AF Aciaetna tiitceannerp Phe = SeDE eRecabot, erema ee iV?