Lo one te ee limitations on such activities at the Pacific Proving Ground ( PG). portion of the experimental program of heaviest DOD participat The on is emphasized. The chapter concludes with a description of Joint Task Fore e 7 the organization that conducted Operation CASTLE, and indicates (JTF 7), how the DOD elements within JTF 7 functioned. Chapter 2 is concerned with the radiological safety (radsaffe) of the tests. This chapter documents the procedures, training, aspects and equip- ment used to protect participants from the radiation exposure } nherent in the test operations. Chapter 3 focuses on the role of the DOD in the experimenta l program of CASTLE in general, leading to a discussion of the DOD operaffions for the test events in particular in Chapters 4 and 5. Chapter 4 4d iscusses the BRAVO detonation, and Chapter 5 presents the detonations fq llowing BRAVO. Chapters 6 through 9 report participation by the Army, Na and Marine Corps, respectively. , Air Force, Chapter 10 summarizes the par icipation of other government agencies and contractors. A listing of pa ticipating units and a statistical characterization of their personnel ex osures are included in these chapters. The personnel exposures are discu sed in Chapter ll. Appendixes include: A -- Radsafe-related documents prepar ld for CASTLE; B -- Glossary of Terms, Abbreviations, Acronyms, and U its; C -- Island Synonyms; and D -- Index of Participating Organiza ions. NUCLEAR TESTS AND RADIATION EXPOSURES Nuclear testing before 1963 usually consisted of the uncon ined detonation of nuclear devices (usually not weapons) in the atmosph re. The devices might be placed on a platform or a barge on the surfac , Placed atop a tower, supported by a balloon, dropped from an airplane 27 or flown