Operation Hardtack

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Image:HardtackOak.JPG Image:HardtackSorocco.JPG Image:RB-57 Juniper.jpg Operation Hardtack I & II was a series of 72 nuclear tests conducted by the United States in 1958. With test moratoriums on the horizon, American weapons labs rushed out many new designs. Hardtack I was carried out in the Pacific Ocean, at Bikini Atoll, Enewetak Atoll, and Johnston Island.

Hardtack II was carried out later that year at the Nevada Test Site. Hardtack II consisted exclusively of low-yield atmospheric and underground tests, and 17 one-point safety tests. All Hardtack I tests were barge shots, and all Hardtack II tests were undergound, unless otherwise noted:



Hardtack I Test Blasts
Test Name Date Location Yield Note
Yucca28 April, 1958Enewetak1.7 kilotonshigh-altitude balloon test
Cactus5 May, 1958 Enewetak18 kilotonssurface shot
Fir11 May, 1958 Bikini Atoll1.36 megatons93.4% fusion yield
Butternut11 May, 1958 Enewetak81 kilotons
Koa12 May, 1958 Enewetak1.37 megatons
Wahoo16 May, 1958 Enewetak9 kilotonsdeep underwater test
Holly20 May, 1958 Enewetak5.9 kilotons
Nutmeg21 May, 1958 Bikini Atoll25.1 kilotons
Yellowwood26 May, 1958 Enewetak330 kilotonsexpected yield 2.5 Megatons
Magnolia26 May, 1958 Enewetak57 kilotons
Tobacco30 May, 1958 Enewetak11.6 kilotons2nd stage failed to ignite
Sycamore31 May, 1958 Bikini Atoll9 kilotonsdeep underwater test
Rose20 May, 1958 Enewetak5.9 kilotons
Umbrella21 May, 1958 Bikini Atoll25.1 kilotons
Maple26 May, 1958 Enewetak330 kilotonsexpected yield 2.5 Megatons
Aspen26 May, 1958 Enewetak57 kilotonsfired in Castle Bravo crater
Walnut14 June, 1958Enewetak1.45 kilotons
Linden18 June, 1958 Enewetak11 kilotons
Redwood27 June, 1958 Bikini Atoll412 kilotons
Elder27 June, 1958 Enewetak880 kilotons
Oak28 June, 1958 Enewetak8.9 megatons
Hickory30 June, 1958Bikini Atoll14 kilotons
Sequoia1 July, 1958 Enewetak5.2 kilotons
Cedar2 July, 1958 Bikini Atoll220 kilotons
Dogwood5 July, 1958 Enewetak397 kilotons
Poplar12 July, 1958 Bikini Atoll9.3 megatons
Scaevola14 July, 1958Enewetakzerosafety test
Pisonia17 July, 1958 Enewetak255 kilotons
Juniper22 July, 1958 Bikini Atoll65 kilotons
Olive22 July, 1958 Enewetak202 kilotons
Pine26 July, 1958 Bikini Atoll2 megatonsexpected yield 4-6 megatons
Teak1 August, 1958Johnston Island3.8 megatons Redstone missile test, 252,000 foot burst height. Miscalculation resulted in detonation directly above launch site.
Quince6 August, 1958 Enewetakzerofizzle
Orange12 August, 1958 Johnston Island3.8 megatonsRedstone missile test, 141,000 foot burst height
Fig18 August, 1958 Enewetak0.02 kilotons last test at Enewetak



Hardtack II Test Blasts
Test Name Date Location Yield Note
Otero12 September, 1958NTS Area 3q0.038 kilotons1PT, failed
Bernalillo17 September, 1958 NTS Area 3h0.015 kilotons1PT; unsafe
Eddy19 September, 1958 NTS Area 7b0.083 kilotonsballon shot
Luna21 September, 1958 NTS Area 3m0.0015 kilotons 1PT; unsafe
Mercury23 September, 1958 NTS Area 12f"slight"1PT
Valencia26 September, 1958 NTS Area 3r0.002 kilotons1PT
Mars28 September, 1958 NTS Area 12f0.013 kilotons1PT
Mora29 September, 1958 NTS Area 7b2 kilotons ballon shot; fizzled
Hidalgo5 October, 1958 NTS Area 7b0.077 kilotonsballon test; failed
Colfax5 October, 1958 NTS Area 3k0.0055 kilotons 1PT; failed
Tamalpais8 October, 1958 NTS Area 12b0.072 kilotons
Quay10 October, 1958 NTS Area 7c0.079 kilotonstower shot
Lea13 October, 1958 NTS Area 7b1.4 kilotons ballon shot; fizzled
Neptune14 October, 1958 NTS Area 12c0.115 kilotons 1pt; failed
Hamilton15 October, 1958 NTS Area 50.0012 tower shot; fizzled
Logan16 October, 1958 NTS Area 12e5 kilotons
Dona Ana16 October, 1958NTS Area 7b0.037 kilotons
Vesta17 October, 1958 NTS Area 9e0.024 kilotons1pt; surface shot; failed
Rio Arriba18 October, 1958 NTS Area 3s0.090 kilotonstower shot
San Juan20 October, 1958 NTS Area 3p"zero"1pt
Sorocco22 October, 1958 NTS Area 3b6 kilotonsballoon shot
Wrangell22 October, 1958NTS Area 50.115 kilotonsballoon shot; fizzle
Oberon22 October, 1958 NTS Area 8a"zero"1pt
Rushmore22 October, 1958 NTS Area 9a0.188 kilotons balloon test; fizzle
Catron24 October, 1958 NTS Area 3T0.021 kilotons1pt; failed
Juno24 October, 1958 NTS Area 9f0.0017 kilotons1pt, surface shot
Ceres26 October, 1958NTS Area 3b0.0007 kilotons 1pt; tower shot
Sanford26 October, 1958 NTS Area 54.9 kilotons balloon shot
De Baca26 October, 1958 NTS Area 7b2.2 kilotons balloon shot
Chavez27 October, 1958 NTS Area 3u0.0006 kilotons 1pt; tower shot; failed
Evans29 October, 1958 NTS Area 12b0.055 kilotonsfizzle
Mazama29 October, 1958NTS Area 9"zero" fizzle
Humbodt29 October, 1958 NTS Area 3v0.0078 kilotonstower shot
Santa Fe30 October, 1958NTS Area 7b1.3 kilotonsballoon shot
Ganymede30 October, 1958 NTS Area 9g"zero"1pt; surface shot
Blanca30 October, 1958 NTS Area 12e22 kilotonslargest test on Hardtack II
Santa Fe30 October, 1958NTS Area 7b1.3 kilotonsballoon shot
Titania30 October, 1958 NTS Area 3c0.0002 kilotons1pt; tower shot
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