Part IV of IV - Military Effects Studies - Sub-kiloton effects
Operation HARDTACK I consisted of 35 nuclear tests conducted at the Pacific Proving Ground between April 28 and August 18, 1958. These tests included balloon, surface, barge, underwater, and rocket-borne high-altitude tests.
The first test, Yucca, was a nuclear device attached to a helium balloon launched from the USS Boxer near Enewetak Atoll.
First portion was the development of nuclear weapons with basic effects on Structures and Materiel. This was a continuation of the type of testing conducted at Enewetak and Bikini during the early and mid-1950s.
Second portion, addressing the military problems of air-borne nuclear weapon defense. Three high-altitude tests featured rocket-borne Teak and Orange at Johnston Island and balloon-hoisted Yucca between Enewetak and Bikini.
Third portion consisted of the underwater tests Wahoo and Umbrella. Wahoo was detonated in the deep, open ocean southwest of Boken Island, and Umbrella inside the western end of the lagoon at Enewetak. The purpose of these tests was to improve the understanding of the effects of underwater explosions on Navy ships and material. These were continuations of earlier underwater testing that included Baker in CROSSROADS at Bikini in 1946 and WIGWAM off the U.S. West Coast in 1955.
The tests comprising the 1958 Operation HARDTACK I were as follows:
YUCCA, April 28, Pacific (between Enewetak and Bikini), balloon, weapons effects, 1.7 kilotons (kt)
CACTUS, May 5, Enewetak, surface, weapons related, 18 kt
FIR, May 11, near Bikini, barge, weapons related, 1.36 megatons (Mt)
BUTTERNUT, May 11, near Enewetak, barge, weapons related, 81 kt
KOA, May 12, Enewetak, surface, weapons related, l.37 Mt
WAHOO, May 16, near Enewetak, underwater, weapons effects, 9 kt
HOLLY, May 20, near Enewetak, barge, weapons related, 5.9 kt
NUTMEG, May 21, near Bikini, barge, weapons related, 25.1 kt
YELLOWWOOD, May 26, near Enewetak, barge, weapons related, 330 kt
MAGNOLIA, May 26, near Enewetak, barge, weapons related, 57 kt
TOBACCO, May 30, near Enewetak, barge, weapons related, 11.6 kt
SYCAMORE, May 31, near Bikini, barge, weapons related, 92 kt
ROSE, June 2, near Enewetak, barge, weapons related, 15 kt
UMBRELLA, June 8, near Enewetak, underwater, weapons effects, 8 kt
MAPLE, June 10, near Bikini, barge, weapons related, 213 kt
ASPEN, June 14, near Bikini, barge, weapons related, 319 kt
WALNUT, June 14, near Enewetak, barge, weapons related, 1.45 Mt
LINDEN, June 18, near Enewetak, barge, weapons related, 11 kt
REDWOOD, June 27, near Bikini, barge, weapons related, 412 kt
ELDER, June 27, near Enewetak, barge, weapons related, 880 kt
OAK, June 28, near Enewetak, barge, weapons related, 8.9 Mt
HICKORY, June 29, near Bikini, barge, weapons related, 14 kt
SEQUOIA, July 1, near Enewetak, barge, weapons related, 5.2 kt
CEDAR, July 2, near Bikini, barge, weapons related, 220 kt
DOGWOOD, July 5, near Enewetak, barge, weapons related, 397 kt
POPLAR, July 12, near Bikini, barge, weapons related, 9.3 Mt
SCAEVOLA, July 14, near Enewetak, barge, safety experiment, zero yield
PISONIA, July 17, near Enewetak, barge, weapons related, 255 kt
JUNIPER, July 22, near Bikini, barge, weapons related, 65 kt
OLIVE, July 22, near Enewetak, barge, weapons related, 202 kt
PINE, July 26, near Enewetak, barge, weapons related, 2 Mt
TEAK, August 1, off Johnston Island area, rocket, weapons effects, 3.8 Mt
QUINCE, August 6, Enewetak, surface, weapons related, zero yield
ORANGE, August 12, off Johnston Island area, rocket, weapons effects, 3.8 Mt
FIG, August 18, Enewetak, surface, weapons related, 20 tons
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