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improved defensive and offensive equipment — including ballistic and cruise missiles that can be launched hundreds of miles from their targets. it had a rocky beginning. the original xb- design, selected by the army air forces in , was for a straight-wing, six-engine, propeller-powered heavy bomber. on
design was approved. as the war worsened in korea, the air force, in , designated the b- the country's next intercontinental bomber and approved an initial production order for b- s. the first b- a flew aug. , . after assembly of three b- as, production converted to b- bs, with more weight and larger engines...
https://www.boeing.com/history/products/b-52-stratofortress.page