Assertion: helicopter's flight | /r/HasProperty | followed in march
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text: The first flight by a German CH-53G was made in 1971, followed in March 1973 by the delivery of the first machines to Heeresfliegerregiment (HFlgRgt, Army Aviation Corps Regiment) 35 in Mendig, and shortly afterwards to the newly formed Army Aviation Corps Regiment 15 based at Rheine and Army Aviation Corps Regiment 25 based at Laupheim.[citation needed]