the Ranpler aircrews during Operation HARDTACK, See Figure 6 for a summary of the B-57B and B-57D flying activities during Operation HARDTACK. The participation of the Naval Effects Element was planned by the Naval Air Special Weapons Facility located at Kirtland AFB. to participate with two (2) AlD's and two (2) Fdli's, They planned The mission of these aircraft was to measure the structural response and blast loading of the aircraft when exposed to nuclear detonations. Participation by the AlD's and the FJl's was practically identical, During April, May and June the FJli's flew seventy-seven hours and the ALDts flew eighty-four hours, These aircraft participated in eight (8) nuclear detonations and flew sixty-nine sorties practicing for these events. They also flew eight (8) sorties for missions which were postponed after the aircraft had become airborne, The events in which they participated were: . CACTUS, BUTTERNUT, KOA, YELLOWWOOD, MAGNOLIA, TOBACCO, ROSE and WALNUT. Some of the earlier shots failed to give the predicted yields and no worthwhile data was obtained from some of these events. On others, how- ever, the WALNUT Event in particular, excellent results were obtained. These aircraft participated in every event as scheduled and experienced no air aborts or pre-take off cancellations. The Navy fighters were loaded on the USS BOXER for transportation to Honolulu on 2) June, concluding their participation in Operation HARDTACK. The USAF had only one (1) effects aircraft in Operation HARDTACK, This aircraft was a B~52 furnished by the Wright Air Development Center. The effects tests were a continuation of the test series conducted during REDWING. On that operation, effects tests head-on and tail-to the detona- tion were carried out. The HARDTACK tests were designed to give data on t AFWUHO Ge oh re —