Last bomb strike without fighters cover

In spite of RAF pilots advices USAF decided to perform bomb strike on Schweinfurt ball bearing plant without fighters cover.
Both RAF and Luftwaffe has studied this lesson during the beginning of war: bombers without fighters cover can reach targets behind the enemy lines only by the cost of great losses, which at the end of the day will become unacceptable. In 1943 USAF still were thinking they will manage.

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