Piasecki H-21

The Piasecki H-21 Workhorse/Shawnee (later Boeing-Vertol CH-21) was a tandem-rotor cargo helicopter of the US military.

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  CH-21C Shawnee transporting M101 105mm howitzer, 1960s.
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  German H-21
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  German H-21
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  Swedish H-21
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  Swedish H-21
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  US Air Force H-21
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  Inside view
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  Cockpit view