On 10 May ZG 1 claimed 26 Dutch aircraft destroyed on the ground on Haamstede airbase.
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Both units were based around Wels in Austria and flew against the US 15th Air Force heavy bombers and fighter escorts.
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In early 1943 5./ZG 1 received several aircraft equipped with the Bordkanone BK 3.7, autoloading 37mm heavy cannon for evaluation as an anti-tank aircraft.