{"version":"1.0","type":"rich","provider_name":"Acast","provider_url":"https://acast.com","height":250,"width":700,"html":"<iframe src=\"https://embed.acast.com/$/55836c0e-56ef-4a51-a7cc-9055cd2a39c7/c1baa3ab-e47d-4036-9c50-085d04cb31fe?\" frameBorder=\"0\" width=\"700\" height=\"250\"></iframe>","title":"American air doctrine and the B-17a bomber","description":"<p>The development of air power in the USA from 1938 onwards in the shape of the B-17a four engine bomber was not matched by an official air doctrine, but a belief in the importance of mass bombing of industrial areas was emerging from planners, air force generals and junior officers throughout the decade.</p> ","author_name":"Nick Shepley"}