wa 3eLs were consistently successful and this was the method used during H‘RDTACK, In the PG there were eleven rehecrscl launchings of the YUCCA type balloon from the BOAER, including one with a duumy wearon and high explosive, before the YUCCA shot. During the p2riod from November 9 to 16, 1957, the U3S GRASP (1R3—=24). in preperation for,and as feasibility studies of her HARDT«CK mission, cone. ducted two positioning tests for underwater devices off OAHU, T. He Associited with the TiK and OR.NGE missiles were pods, some of which had to be located and recovered fron the ocean sfter the shots. In addition, there were several rocket pro:rams, including samplinz rockets, which required posteshot location ane recovery of nose cones and other perts, Pre= liminary location and recovery teste were heir at Salton 3ea, California on December 6 and 7, 1957 and off Point Mugu, Californie between January 20 and 23, 1958. A full sezle Tas’ Force rehearsal of the TEAK event, to include token evacuetion of the Bikini Atoll, was cancelled when T_.K was moved to Johnston Island. Commander, Joint Task Force S=VnN then desided ito iold a full scale rehearsal of the riR evert, to include those parts of POPLAR and SYCAIONE which required virtuaily complete evacuabion of Bikini. The USS POOR and USNS AINS‘IORTH proceeded to their assigned areas of operretion approxinetely thirty miles south of ENYU, Communications were thorauenly tested, but only token evacuction of personnel was dirdcted and cerricd out. Cn Ninmusei, day, Joint Task Force SEVEN held a rchearsal of UiERELLA including positioning of ships, lowering the durmy d: ice, token evacuation from ships of the target array, and a complete test of conmnications, This was the last full scale rehearsal at the EPG, In preparation for each shot, Task Group 7.1 held numerous dry runs of the timing and firing systems. f topien ; Dart INA DQ na vk The runs were normally conducted twice a car om pace SS Gi