15 June 1954 FINAL REPORT BY THE COMMANDER, JOINT TASK FORCE SEVEN to the JOINT CHIEFS OF STAFF AND CHAIRMAN, ATOMIC ENERGY COMMISSION on 1954 OVERSEAS WEAPONS TESTS OPERATION "CASTLE" Reference: a. b. JCS 2179/43 JCS 2179/46 &. JCS 2179/47 d. JCS 2179/49 @. JCS 2179/52 f. JCS 2179/53 g. JCS 2179/62 THE PROBLEM 1. To present a report of the activities of Joint Task Force SEVEN during Operation CASTLE to the Joint Chiefs of Staff in compliance with paragraph 7 of Enclosure "A" to JCS 2179/47, and to the Chairman, Atomic Energy Commission. DISCUSSION 2. (See Enclosure) CONCLUSIONS 3. The mission of Joint Task Force SEVEN, as delineated in Enclosure "A" to JCS 2179/47, was successfully accomplished. 4. The issuance of press releases prior to the beginning of the operation, again after several of the detonations and at the conclusion of the series proved to be sound procedure. 5. In view of the high yield of the devices and weapons tested, the danger area established prior to the operation proved to be too small. The enlarged area adopted after the first detonation was adequate for the devices and weapons tested. 6. Information is needed as to the possibility of a high yield detonation causing a tsunami under varied conditions of firing. 7. The designation of the task force commander as senior representative of the Atomic Energy Commission at the Pacific Proving Grounds facilitated overseas < \ Co,0 Lan -1- he "Yo, MORE, i wee we ae a Sot