Headquarters$Joint Task Force SEVEN Washington25Y D. C. 1 October1957 OPERATIONPLAN 1-58 (HARDTACK) References: a. U. S. Navy HydrographicChart No. 5203,North PacificOcean, MARSHALL ISLANDS. b. U. S. Navy HydrographicChart No. 6032, North PacificOcean, bMSHALL ISLANDS- NorthernPart, Bikini Atoll. c. U. S. Navy HydrographicChart No..6033, North PacificOcean, MAILSHALLISLANDS,EniwetokAtoll. Time Zone: M Definitionof terms used in this plan: “EniwetokProving Ground (EPG)u;‘tCloeed Arealt:Includeethe l~d areae of ENIWETOKand BIKINI Atol.le,the areas of the res~ective lagoons and the water areaswithin three (3) miles to the-seaward side of the respectiveland areas. ‘fForward AreaT!:Includesthe EPG and adjoiningPacific areas in which task force persomel are deployedin supportof Operation HARDTACK. “DestructionArea”: Encompassesthe ground and sea areas around the zero points for each shot from which ships and importantequipment, not necessaryfor the diagnosticmeasurementsof effects program of that shot~ shall be removedprior to the detonation. “DangerArea”: Will includethe EPG and an adjacentarea encompassing about 4COjO00 squaremiles. This area will be dangerousto all ships, aircraftand personnel,due to hazardsfrom the testing of atomicweapons. ~ ~ol Arean: A designatedairspaceover the land and encompassing d Bikini Atolls,the wat upwardsto unlimited in the airspace altitudes. ~ aircraf f paes under the air controlof CTG 7.4. ea will be announcedlater. 1. GENIWIL INFORMATION. a. A series of tests of atomic weaponsand devices (codename, OperationHARDTACK),to be conductedat the EniwetokProving Ground duringthe Spring and Summer of 1958, has been approved by the U. S. Atomicl%ner~ Commissionand the Departmentof Defense. The serie$will consistof approximatelytwenty-five detonations,five of which are of prhary interestto the Department of Defenseand approximatelyten each which are of primary interestto and the responsibilityof the Los AlamosScientific Laboratoryand the Universityof CaliforniaRadiationLaboratory, respectively. First detonationis scheduledfor lSApril1958. The series will be conductedas expeditiouslyas practicable,with a completiontarget date of no later than 1 July 1958. Necessity for possible reconsiderationof this completiontarget date is recognized. A startingdate for the operationtiphase will be as later agreedbetweenthe AtomicEnergy Commissionand the Department of Defense.