1.1 LOS ALAMOS SCIENTIFIC LABORATORY A total of 14 full scale tests and one safety test were carried out by | LASL in Operation Hardtack. Two of the tests were heavily instrumented and for this reason were fired on land. The other 13 were fired on barges to facilitate readiness and minimize contamination problems. The devices and yields are given on page 9. 1.2 UNIVERSITY OF CALIFORNIA RADIATION LABORATORY During the course of Operation Hardtack. <5 are given on page 9. _ 1.3 DELETED , and the remainder » . Measuredyields DEPARTMENT OF DEFENSE Under the authority of letter, file SWPWT/960, Chief, Armed Forces Special Weapons Project, dated 2 June 1953, Subject: "Tests Involving Nuclear Detonations Participated in or Conducted by Agencies of the Government of the United States Outside the Continental United States," the AFSWP responsibility for the preparation, operation, and post-operation phases of Operation Hardtack was assigned to the Commander, Field Command, AFSWP. The Joint Chiefs of Staff authorized AFSWP te plan and implement, in coordination with the various services and the AEC, the following: 1. Appropriate test programs to be conducted in conjunction with the following detonations: «> } oe 2. The selection of the appropriate nuclear devices. 19 ARWL/HL 18