What rhymes with necessary evil?
nec·es·sa·ry evil

Necessary Evil, also referred to as Plane #91, was the name of a B-29 Superfortress participating in the atomic bomb attack on Hiroshima on August 6, 1945. Assigned to the 393d Bomb Squadron, 509th Composite Group, it was used as a camera plane to photograph the explosion and effects of the bomb, and to carry scientific observers. At the time of the attack the plane was not named and was known only by its 393d Victor number. The mission was flown by crew B-10, with Captain George Marquardt as aircraft commander. The crew regularly assigned to this airplane in turn flew another on the Nagasaki mission on August 9, 1945, the B-29 Big Stink, though without their aircraft commander, who was ill.

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