https://l450v.alamy.com/450v/t15cj6/gunners-and-belts-of-ammunition-fed-to-the-beam-guns-of-a-boeing-b-17-flying-fortress-the-four-engined-heavy-bomber-used-by-the-united-states-eighth-air-force-mostly-based-in-southern-england-the-b-17-was-primarily-employed-by-the-usaaf-in-the-daylight-strategic-bombing-campaign-against-german-industrial-and-military-targets-but-also-complemented-the-raf-bomber-commands-nighttime-area-bombing-in-the-combined-bomber-offensive-to-help-secure-air-superiority-over-the-cities-factories-and-battlefields-of-western-europe-in-preparation-for-the-invasion-of-france-in-1944-t15cj6.jpg