A Boeing B-17 Flying Fortress undergoes heavy engine maintenance at the Oklahoma City Air Depot in this undated photo from 1942. B-17s received Norden bombsight upgrades at the facility.

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Size: 1657px × 1207px
Photo credit: © Chuck Little / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: -17, air, america, archive, armed, army, bombsight, defence, flying, force, forces, fortress, maintenance, military, navy, norden, reportage, service, serviceman, servicemen, soldier, states, united, usa