May 20, 1956

1956Douglas Preston, American journalist and author^[†]

Douglas Jerome Preston is an American journalist and author. Although he is best known for his thrillers in collaboration with Lincoln Child, he has also written six solo novels, including the Wyman Ford series and a novel entitled Jennie, which was made into a movie by Disney. He has authored a half-dozen nonfiction books on science and exploration and writes occasionally for The New Yorker, Smithsonian, and other magazines.

1956In Operation Redwing, the first United States airborne hydrogen bomb is dropped over Bikini Atoll in the Pacific Ocean.^[†]

Operation Redwing was a United States series of 17 nuclear test detonations from May to July 1956. They were conducted at Bikini and Enewetak atolls by Joint Task Force 7 (JTF7). The entire operation followed Project 56 and preceded Project 57. The primary intention was to test new, second-generation thermonuclear weapons. Also tested were fission devices intended to be used as primaries for thermonuclear weapons, and small tactical weapons for air defense. Redwing demonstrated the first United States airdrop of a deliverable hydrogen bomb during test Cherokee. Because the yields for many tests at Operation Castle in 1954 were dramatically higher than predictions, Redwing was conducted using an "energy budget": There were limits to the total amount of energy released, and the amount of fission yield was also strictly controlled. Fission, primarily "fast" fission of the natural uranium tamper surrounding the fusion capsule, greatly increases the yield of thermonuclear devices, and constitutes the great majority of the fallout, as nuclear fusion is a relatively clean reaction.