Code-named "Bravo," America's first hydrogen bomb is tested on Bikini...

Code-named "Bravo," America's first hydrogen bomb is tested on Bikini Atoll in the Marshall Islands. It was the most powerful nuclear explosion ever detonated by the U.S., a thousand trimes more powerful than the bomb that was dropped on Hiroshima in 1945. (March 1, 1954) Credit: U.S. Department of Defense Photo

SUBSCRIBE

Unlimited Digital AccessOnly 25¢for 6 months

ACT NOWSALE ENDS SOON | CANCEL ANYTIME