5. Thearming party made final preparations at the zero area and connected the device to the firing system when directed by the Task Group Commander. "6, Disarming was accomplished by disconnecting the device from the firing system and returning the zero area to normal dry run conditions. These functions were carried out whenever the event was delayed for periods requiring access tg-the danger areas by other personnel. During the Hardtack operation all shots were armed and detonated successfully, although disarming was required many times when the weather forced delay of shot and one time due to a technical failure at —15 min to zero time. Arming books were prepared on each shot and will be available for reference purposes in the Hardtack 7.1 files in the Records Management Section at LASL. These data books contain check sheets, pictures, and a dry run log. 1. The check sheets are for the compatability test, interlock test, and arming procedures. 2. ‘The pictures show the layout at the zero site of the device and associated firing equipment immediately prior to the departure of the arming party. 3. The dry run log provides a record of the number of dry runs for each event and the checks, calibration, and repairs of the firing components through the final run. Based on the experience during Hardtack, the following recommendations are worth noting: . 1. The Pinex barge weapon cabs did not provide sufficient space to comfortably accommodate the shot components and the working personnel. If this type of barge is utilized in the future, it is suggested that more space be provided for working room and equipment installation. 2. In consideration of reliability and shot preparation time, an attempt should be made by the organizations concerned to further standardize the arming and firing components. 8. Every effort should be made to limit the number of personnel present at the zero sites, especially during initial setup and dry run periods. 4. Personnel were sometimes called upon to work long, exhausting hours under adverse conditions. The possible gain should be carefully weighed against personnel safety and well-being, and the use of such practices should be minimized. 3.13 COMMUNICATIONS Task Group 7.1 was assigned the following communications responsibilities by CJTF 7 for Operation Hardtack. 1. Provide, operate, and maintain special communications - electronic equipment required for conduct of scientific test programs. 2. Initiate the voice time broadcasts for all elements of the Task Force. 3. Coordinate special communications requirements originating by sub- ordinate task units. 4. Prepare a TG 7.1 telephone directory for the EPG and Johnston Island. 102