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For me it's got to be the Stuka. The siren struck untold fear in the hearts and minds of its targets, civilians and military alike. The Stuka reached its high point at the Battle of Kursk. The ones fitted with anti tank cannons (See below) were just the sickest Luftwaffe planes ever.
This video captures the Stuka at its best angles. It's a real shame it had to be a German plane.