PART I Introduction Operation Sandstone was designed to conduct tests of atomic weapons to determine the desirability of stockpiling certain weapons of improved design and performance and to establish fundamental data upon which to base future weapon design. The operation was conducted at the behest, and under the auspices, of the Atomic Energy Commission. Joint Task Force Seven was organized and commanded by Lieutenant General John E. Hull at the direction of the Joint Chiefs of Staff. The mission assigned the Joint Task Force by the Joint Chiefs of Staff was to construct an atomic proving ground at Eniwetok Atoll for the Atomic Energy Commission and to support the Atomic Energy Commission in the conduct of the initial test operations.